{"id":300,"date":"2026-11-07T15:03:57","date_gmt":"2026-11-07T15:03:57","guid":{"rendered":"https:\/\/devdojo.co.in\/?p=300"},"modified":"2026-11-07T15:03:58","modified_gmt":"2026-11-07T15:03:58","slug":"nodejs-26-lts-new-features-upgrade","status":"publish","type":"post","link":"https:\/\/devdojo.co.in\/index.php\/2026\/11\/07\/nodejs-26-lts-new-features-upgrade\/","title":{"rendered":"Node.js 26 LTS: New Features and How to Upgrade Safely"},"content":{"rendered":"\n<div class=\"dd-post\">\n<style>\n.single article:has(.dd-hero) .entry-media{display:none}\n.dd-post{--navy:#0b1020;--blue:#3178c6;--violet:#7c5cff;--ink:#1f2433;--muted:#5b6275;--line:#e3e6ef;font-size:17px;line-height:1.75;color:var(--ink)}\n.dd-post h2{margin:2.2em 0 .6em;font-size:1.6em;line-height:1.3;scroll-margin-top:90px}\n.dd-post h3{margin:1.6em 0 .5em;font-size:1.22em;scroll-margin-top:90px}\n.dd-post a{color:var(--blue);text-decoration:underline;text-underline-offset:3px}\n.dd-post 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.ic.html{background:#e44d26;color:#fff}.dd-post .ic.css{background:#563d7c;color:#fff}\n.dd-post .ic.ts{background:#3178c6;color:#fff}.dd-post .ic.json{background:#cbcb41}.dd-post .ic.dk{background:#2496ed;color:#fff}\n.dd-post .dd-steps{counter-reset:st;list-style:none;margin:1.2em 0;padding:0}\n.dd-post .dd-steps>li{position:relative;padding:0 0 0 46px;margin:0 0 14px}\n.dd-post .dd-steps>li::before{counter-increment:st;content:counter(st);position:absolute;left:0;top:2px;width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,#3178c6,#7c5cff);color:#fff;font-weight:700;text-align:center;line-height:32px}\n.dd-post .dd-badge{display:inline-block;background:#151b3b;color:#dfe3ff;border-radius:999px;padding:4px 12px;font-size:.85em;font-weight:600;margin:0 0 .8em}\n<\/style>\n<div class=\"dd-hero\">\n<svg viewBox=\"0 0 1200 520\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Node.js 26 LTS banner: upgrade path from Node.js 22 and 24 to Node.js 26 LTS with new features listed\">\n<defs>\n<linearGradient id=\"n26bg\" x1=\"0\" y1=\"0\" x2=\"1\" y2=\"1\"><stop offset=\"0\" stop-color=\"#0b1020\"\/><stop offset=\"1\" stop-color=\"#151b3b\"\/><\/linearGradient>\n<linearGradient id=\"n26ac\" x1=\"0\" y1=\"0\" x2=\"1\" y2=\"0\"><stop offset=\"0\" stop-color=\"#3178c6\"\/><stop offset=\"1\" stop-color=\"#7c5cff\"\/><\/linearGradient>\n<linearGradient id=\"n26gr\" x1=\"0\" y1=\"0\" x2=\"1\" y2=\"0\"><stop offset=\"0\" stop-color=\"#5fa04e\"\/><stop offset=\"1\" stop-color=\"#89e051\"\/><\/linearGradient>\n<radialGradient id=\"n26glow\" cx=\".5\" cy=\".5\" r=\".5\"><stop offset=\"0\" stop-color=\"#7c5cff\" stop-opacity=\".45\"\/><stop offset=\"1\" stop-color=\"#7c5cff\" stop-opacity=\"0\"\/><\/radialGradient>\n<\/defs>\n<rect x=\"0\" y=\"-60\" width=\"1200\" height=\"640\" fill=\"url(#n26bg)\"\/>\n<circle cx=\"930\" cy=\"300\" r=\"280\" fill=\"url(#n26glow)\"\/>\n<g opacity=\".12\" stroke=\"#9fb2ff\"><path d=\"M0 100H1200M0 200H1200M0 300H1200M0 400H1200M200 0V520M400 0V520M600 0V520M800 0V520M1000 0V520\"\/><\/g>\n<rect x=\"60\" y=\"46\" width=\"200\" height=\"38\" rx=\"19\" fill=\"url(#n26ac)\"\/>\n<text x=\"160\" y=\"71\" text-anchor=\"middle\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"18\" font-weight=\"700\" fill=\"#fff\">LTS \u00b7 &#8220;Lithium&#8221;<\/text>\n<text x=\"276\" y=\"71\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"18\" fill=\"#aab4e8\">Backend \u00b7 Node.js \u00b7 DevDojo<\/text>\n<text x=\"60\" y=\"150\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"60\" font-weight=\"800\" fill=\"#ffffff\">Node.js 26 LTS<\/text>\n<text x=\"60\" y=\"208\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"28\" font-weight=\"800\" fill=\"#c9d1ff\">New features and a safe upgrade path<\/text>\n<text x=\"60\" y=\"252\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"20\" fill=\"#aab4e8\">Temporal \u00b7 getOrInsert \u00b7 localStorage \u00b7 base64<\/text>\n<g font-family=\"Consolas,monospace\" font-size=\"20\">\n<rect x=\"60\" y=\"296\" width=\"470\" height=\"160\" rx=\"14\" fill=\"#1e1e1e\" stroke=\"#2b2b2b\"\/>\n<circle cx=\"84\" cy=\"318\" r=\"6\" fill=\"#ff5f57\"\/><circle cx=\"104\" cy=\"318\" r=\"6\" fill=\"#febc2e\"\/><circle cx=\"124\" cy=\"318\" r=\"6\" fill=\"#28c840\"\/>\n<text x=\"84\" y=\"358\" fill=\"#89d185\">$ <tspan fill=\"#d4d4d4\">nvm install <\/tspan><tspan fill=\"#b5cea8\">26<\/tspan><\/text>\n<text x=\"84\" y=\"392\" fill=\"#89d185\">$ <tspan fill=\"#d4d4d4\">node -v<\/tspan><\/text>\n<text x=\"84\" y=\"426\" fill=\"#cccccc\">v26.x  <tspan fill=\"#6a9955\">\/\/ Active LTS<\/tspan><\/text>\n<\/g>\n<path id=\"n26p1\" d=\"M770 420 C 810 420, 820 330, 856 315\" fill=\"none\" stroke=\"#3178c6\" stroke-width=\"2.5\" stroke-dasharray=\"6 6\" opacity=\".75\"\/>\n<path id=\"n26p2\" d=\"M770 180 C 810 180, 820 270, 856 285\" fill=\"none\" stroke=\"#7c5cff\" stroke-width=\"2.5\" stroke-dasharray=\"6 6\" 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fill=\"#aab4e8\">from<\/text><text x=\"710\" y=\"438\" text-anchor=\"middle\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"20\" font-weight=\"800\" fill=\"#fff\">Node 22<\/text><\/g>\n<g class=\"node\"><circle cx=\"930\" cy=\"300\" r=\"78\" fill=\"#0b1020\" stroke=\"url(#n26gr)\" stroke-width=\"5\"\/><text x=\"930\" y=\"292\" text-anchor=\"middle\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"40\" font-weight=\"800\" fill=\"#fff\">26<\/text><text x=\"930\" y=\"324\" text-anchor=\"middle\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"18\" font-weight=\"700\" fill=\"#89e051\">LTS<\/text><\/g>\n<g class=\"node\"><rect x=\"1040\" y=\"150\" width=\"130\" height=\"44\" rx=\"22\" fill=\"#151b3b\" stroke=\"#3178c6\"\/><text x=\"1105\" y=\"178\" text-anchor=\"middle\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"16\" fill=\"#fff\">Temporal<\/text><\/g>\n<g class=\"node\"><rect x=\"1040\" y=\"278\" width=\"130\" height=\"44\" rx=\"22\" fill=\"#151b3b\" stroke=\"#7c5cff\"\/><text x=\"1105\" y=\"306\" text-anchor=\"middle\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"16\" fill=\"#fff\">V8 14.6<\/text><\/g>\n<g class=\"node\"><rect x=\"1040\" y=\"406\" width=\"130\" height=\"44\" rx=\"22\" fill=\"#151b3b\" stroke=\"#61dafb\"\/><text x=\"1105\" y=\"434\" text-anchor=\"middle\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"16\" fill=\"#fff\">Undici 8<\/text><\/g>\n<path d=\"M1008 290 L1040 172 M1008 300 L1040 300 M1008 310 L1040 428\" stroke=\"#3a4380\" stroke-width=\"2\"\/>\n<text x=\"60\" y=\"495\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"17\" fill=\"#7f88b8\">devdojo.co.in<\/text>\n<\/svg>\n<\/div>\n<span class=\"dd-badge\">Standalone guide \u00b7 Backend \u00b7 Node.js<\/span>\n<p><strong>Node.js 26 LTS<\/strong> is now the newest long-term support version of Node.js. Node.js 26 first came out in May as a &#8220;Current&#8221; release, and on 28 October it moved to LTS with version 26.13.0 and the code name <em>Lithium<\/em>. That means it is now the version most teams should plan to use in production. In this guide you will learn what is new in Node.js 26 LTS, what was removed, and how to upgrade your app step by step \u2013 with runnable code for every feature.<\/p>\n<div class=\"dd-summary\"><strong class=\"lbl\">Quick Summary<\/strong>\n<ul>\n<li>Node.js 26 became <strong>LTS on 28 Oct<\/strong> (v26.13.0, &#8220;Lithium&#8221;). With the usual 30-month support window it gets fixes until about April 2029.<\/li>\n<li>Biggest new features: the <strong>Temporal API is on by default<\/strong>, V8 14.6 adds <code>Map.prototype.getOrInsert()<\/code> and <code>Iterator.concat()<\/code>, and fetch now runs on <strong>Undici 8<\/strong>.<\/li>\n<li>Coming from Node.js 24 you also get the Node.js 25 changes: <strong>localStorage<\/strong>, <strong>Uint8Array base64\/hex<\/strong> helpers, <code>--allow-net<\/code> in the permission model, and no Corepack in the installer.<\/li>\n<li>Breaking changes to check: <code>res.writeHeader()<\/code>, the <code>_stream_*<\/code> modules and <code>--experimental-transform-types<\/code> are gone, and native addons must be rebuilt.<\/li>\n<li>Safe path: install with nvm, pin with <code>.nvmrc<\/code>, fix removed APIs, run tests with <code>--trace-deprecation<\/code>, then update CI and Docker.<\/li>\n<\/ul><\/div>\n<nav class=\"dd-toc\" aria-label=\"Table of contents\"><strong>In this guide<\/strong>\n<ol>\n<li><a href=\"#what-is-lts\">What &#8220;Node.js 26 LTS&#8221; means<\/a><\/li>\n<li><a href=\"#which-version\">Which version should you use?<\/a><\/li>\n<li><a href=\"#check-version\">Check your Node.js version<\/a><\/li>\n<li><a href=\"#new-features\">Node.js 26 LTS new features<\/a><\/li>\n<li><a href=\"#from-node-25\">Features you also get from Node.js 25<\/a><\/li>\n<li><a href=\"#typescript\">Running TypeScript directly<\/a><\/li>\n<li><a href=\"#breaking-changes\">Breaking changes and how to fix them<\/a><\/li>\n<li><a href=\"#upgrade\">How to upgrade step by step<\/a><\/li>\n<li><a href=\"#errors\">Common errors and fixes<\/a><\/li>\n<li><a href=\"#best-practices\">Best practices<\/a><\/li>\n<li><a href=\"#faq\">FAQ<\/a><\/li>\n<\/ol><\/nav>\n<\/div>\n\n\n\n<div class=\"dd-post\">\n<h2 id=\"what-is-lts\">What &#8220;Node.js 26 LTS&#8221; means<\/h2>\n<p>Node.js ships a new major version twice a year. Odd numbers (like 25) are short-lived. Even numbers (like 22, 24 and 26) start as <strong>Current<\/strong> for about six months, so library authors can test them, and then become <strong>LTS<\/strong> \u2013 Long Term Support. LTS means the Node.js team promises bug fixes and security patches for a long time, which is exactly what you want for a production server.<\/p>\n<p>Here are the key facts for Node.js 26:<\/p>\n<div class=\"dd-cards\">\n<div class=\"dd-card\"><b>Released<\/b>5 May as v26.0.0 (Current)<\/div>\n<div class=\"dd-card\"><b>Became LTS<\/b>28 Oct, v26.13.0, code name &#8220;Lithium&#8221;<\/div>\n<div class=\"dd-card\"><b>Engine<\/b>V8 14.6 (same as Chromium 146), Undici 8 for fetch<\/div>\n<div class=\"dd-card\"><b>Support<\/b>About 30 months in total \u2013 roughly until April 2029<\/div>\n<\/div>\n<p>There is one more change worth knowing: according to the official <a href=\"https:\/\/nodejs.org\/en\/about\/previous-releases\" rel=\"noopener\" target=\"_blank\">Node.js releases page<\/a>, starting with Node.js 27 there will be <strong>one major release per year<\/strong>, and every major version will become LTS. Node.js 26 is the last release of the old &#8220;twice a year&#8221; schedule.<\/p>\n<figure>\n<svg viewBox=\"0 0 900 330\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Node.js release timeline showing Node 22, 24 and 26 with Current, Active LTS and Maintenance phases, and Node 20 already end of life\">\n<rect width=\"900\" height=\"330\" rx=\"14\" fill=\"#0b1020\"\/>\n<g font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"13\" fill=\"#8d96c4\">\n<text x=\"150\" y=\"40\">2024<\/text><text x=\"270\" y=\"40\">2025<\/text><text x=\"390\" y=\"40\">2026<\/text><text x=\"510\" y=\"40\">2027<\/text><text x=\"630\" y=\"40\">2028<\/text><text x=\"750\" y=\"40\">2029<\/text>\n<\/g>\n<g stroke=\"#262e5a\"><path d=\"M150 50V290M270 50V290M390 50V290M510 50V290M630 50V290M750 50V290\"\/><\/g>\n<line x1=\"490\" y1=\"50\" x2=\"490\" y2=\"290\" stroke=\"#ffd43b\" stroke-width=\"2\" stroke-dasharray=\"4 4\"\/>\n<text x=\"494\" y=\"300\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12\" fill=\"#ffd43b\">today (Nov)<\/text>\n<g font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"15\" font-weight=\"700\" fill=\"#fff\"><text x=\"20\" y=\"92\">Node 20<\/text><text x=\"20\" y=\"152\">Node 22<\/text><text x=\"20\" y=\"212\">Node 24<\/text><text x=\"20\" y=\"272\">Node 26<\/text><\/g>\n<rect x=\"110\" y=\"76\" width=\"300\" height=\"24\" rx=\"6\" fill=\"#3a3f55\"\/><text x=\"120\" y=\"93\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12\" fill=\"#d0d4e6\">EOL since March 2026<\/text>\n<rect x=\"180\" y=\"136\" width=\"58\" height=\"24\" rx=\"6\" fill=\"#3178c6\"><\/rect><rect x=\"240\" y=\"136\" width=\"118\" height=\"24\" rx=\"6\" fill=\"#5fa04e\"><\/rect><text x=\"246\" y=\"153\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12\" fill=\"#fff\">Active LTS<\/text><rect x=\"360\" y=\"136\" width=\"178\" height=\"24\" rx=\"6\" fill=\"#8a6d1f\"><\/rect><text x=\"366\" y=\"153\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12\" fill=\"#fff\">Maintenance<\/text>\n<rect x=\"310\" y=\"196\" width=\"48\" height=\"24\" rx=\"6\" fill=\"#3178c6\"><\/rect><rect x=\"360\" y=\"196\" width=\"118\" height=\"24\" rx=\"6\" fill=\"#5fa04e\"><\/rect><text x=\"366\" y=\"213\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12\" fill=\"#fff\">Active LTS<\/text><rect x=\"480\" y=\"196\" width=\"178\" height=\"24\" rx=\"6\" fill=\"#8a6d1f\"><\/rect><text x=\"486\" y=\"213\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12\" fill=\"#fff\">Maintenance<\/text>\n<rect x=\"430\" y=\"256\" width=\"48\" height=\"24\" rx=\"6\" fill=\"#3178c6\"><\/rect><rect x=\"480\" y=\"256\" width=\"118\" height=\"24\" rx=\"6\" fill=\"#5fa04e\"><animate attributeName=\"opacity\" values=\"1;.55;1\" dur=\"2s\" repeatCount=\"indefinite\"\/><\/rect><text x=\"486\" y=\"273\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12\" fill=\"#fff\">Active LTS<\/text><rect x=\"600\" y=\"256\" width=\"178\" height=\"24\" rx=\"6\" fill=\"#8a6d1f\"><\/rect><text x=\"606\" y=\"273\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12\" fill=\"#fff\">Maintenance (\u2248 to Apr 2029)<\/text>\n<g font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12\" fill=\"#d0d4e6\"><rect x=\"600\" y=\"70\" width=\"14\" height=\"14\" rx=\"3\" fill=\"#3178c6\"\/><text x=\"620\" y=\"82\">Current<\/text><rect x=\"690\" y=\"70\" width=\"14\" height=\"14\" rx=\"3\" fill=\"#5fa04e\"\/><text x=\"710\" y=\"82\">Active LTS<\/text><rect x=\"600\" y=\"96\" width=\"14\" height=\"14\" rx=\"3\" fill=\"#8a6d1f\"\/><text x=\"620\" y=\"108\">Maintenance LTS<\/text><\/g>\n<\/svg>\n<figcaption>Each even-numbered Node.js release spends about six months as &#8220;Current&#8221;, then moves to Active LTS and later Maintenance \u2013 roughly 30 months of fixes in total. Dates after today are planned, not guaranteed.<\/figcaption>\n<\/figure>\n\n<h2 id=\"which-version\">Which version should you use?<\/h2>\n<div class=\"dd-tablewrap\"><table>\n<thead><tr><th>Version<\/th><th>Status today<\/th><th>What to do<\/th><\/tr><\/thead>\n<tbody>\n<tr><td><strong>Node.js 26<\/strong> (Lithium)<\/td><td>Active LTS<\/td><td>Use for new projects. Plan upgrades of existing apps to it.<\/td><\/tr>\n<tr><td>Node.js 24 (Krypton)<\/td><td>LTS (moving to Maintenance)<\/td><td>Safe for now. Upgrade in the next few months.<\/td><\/tr>\n<tr><td>Node.js 22 (Jod)<\/td><td>Maintenance LTS<\/td><td>Only critical fixes. Upgrade soon \u2013 it ends around April 2027.<\/td><\/tr>\n<tr><td>Node.js 20 (Iron)<\/td><td>End of life<\/td><td>No more security fixes. Upgrade now.<\/td><\/tr>\n<tr><td>Node.js 25 \/ 27<\/td><td>EOL \/ alpha<\/td><td>Do not use in production.<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<div class=\"dd-note\"><strong>Note:<\/strong> always install the <em>latest<\/em> 26.x patch, not exactly 26.13.0. Security releases come out every few weeks, and the Node.js team has already announced one for 11 November.<\/div>\n<p>New to Node.js? Start with <a href=\"https:\/\/devdojo.co.in\/index.php\/2026\/10\/23\/nodejs-series-part-1-what-is-nodejs\/\">Node.js Part 1: What Is Node.js and How to Build Your First Node.js App<\/a> from our beginner series, then come back here.<\/p>\n\n<h2 id=\"check-version\">Check your Node.js version<\/h2>\n<p>Before you upgrade, check what you are running. This tiny script prints the version, the LTS code name and whether the new features are there. On Node.js 24 you would see <code>Krypton<\/code>, <code>undefined<\/code> for Temporal and <code>undefined<\/code> for <code>getOrInsert<\/code>.<\/p>\n<div class=\"dd-vsc\" role=\"group\" aria-label=\"Code editor: check-node.mjs\">\n<input type=\"radio\" name=\"v1\" id=\"v1f1\" class=\"f1\" checked>\n<input type=\"checkbox\" id=\"v1r1\" class=\"r1\">\n<div class=\"dd-vsc-bar\"><span class=\"dd-dots\"><i><\/i><i><\/i><i><\/i><\/span><span class=\"dd-vsc-title\">check-node.mjs \u2014 node26-demo \u2014 Visual Studio Code<\/span><\/div>\n<div class=\"dd-vsc-tabs\">\n<label for=\"v1f1\" class=\"t1\"><b class=\"ic js\">JS<\/b>check-node.mjs<\/label>\n<label for=\"v1r1\" class=\"run run1\" title=\"Show the output in the terminal\">\u25b6 Run<\/label>\n<\/div>\n<div class=\"dd-vsc-pane p1\">\n<div class=\"dd-vsc-crumbs\">node26-demo \u203a check-node.mjs<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\">\/\/ check-node.mjs - is this machine really on Node.js 26 LTS?<\/span><\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Node version :'<\/span>, <span class=\"nb\">process<\/span>.<span class=\"n\">version<\/span>);<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'LTS codename :'<\/span>, <span class=\"nb\">process<\/span>.<span class=\"n\">release<\/span>.<span class=\"n\">lts<\/span>);<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'V8 engine    :'<\/span>, <span class=\"nb\">process<\/span>.<span class=\"n\">versions<\/span>.<span class=\"n\">v8<\/span>.<span class=\"nf\">split<\/span>(<span class=\"s\">'.'<\/span>).<span class=\"nf\">slice<\/span>(<span class=\"m\">0<\/span>, <span class=\"m\">2<\/span>).<span class=\"nf\">join<\/span>(<span class=\"s\">'.'<\/span>));<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Temporal     :'<\/span>, typeof <span class=\"nb\">Temporal<\/span>);<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'getOrInsert  :'<\/span>, typeof <span class=\"nb\">Map<\/span>.<span class=\"n\">prototype<\/span>.<span class=\"n\">getOrInsert<\/span>);<\/span><\/code><\/pre>\n<div class=\"dd-vsc-term\"><div class=\"dd-term-head\"><span>TERMINAL<\/span><span>OUTPUT<\/span><span>PROBLEMS<\/span><span class=\"dd-term-note\">Example output \u2013 Node.js 26.13.0 (first LTS release)<\/span><\/div><pre><code><span class=\"gp\">$<\/span> node check-node.mjs\nNode version : v26.13.0\nLTS codename : Lithium\nV8 engine    : 14.6\nTemporal     : object\ngetOrInsert  : function<\/code><\/pre><\/div>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 6, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>JavaScript<\/span><\/div>\n<\/div>\n<\/div>\n<p class=\"dd-vsc-hint\">Click \u25b6 Run to see what Node.js 26 prints.<\/p>\n<\/div>\n\n\n\n<div class=\"dd-post\">\n<h2 id=\"new-features\">Node.js 26 LTS new features<\/h2>\n<h3>1. Temporal API is on by default<\/h3>\n<p>The JavaScript <code>Date<\/code> object is famous for bugs: months start at 0, objects change when you did not expect it, and time zones are painful. <strong>Temporal<\/strong> is the modern replacement, and in Node.js 26 it is a global \u2013 no package, no flag. You get separate types for a date (<code>PlainDate<\/code>), a time (<code>PlainTime<\/code>) and a date-time in a real time zone (<code>ZonedDateTime<\/code>).<\/p>\n<div class=\"dd-vsc\" role=\"group\" aria-label=\"Code editor: temporal-basics.mjs\">\n<input type=\"radio\" name=\"v2\" id=\"v2f1\" class=\"f1\" checked>\n<input type=\"checkbox\" id=\"v2r1\" class=\"r1\">\n<div class=\"dd-vsc-bar\"><span class=\"dd-dots\"><i><\/i><i><\/i><i><\/i><\/span><span class=\"dd-vsc-title\">temporal-basics.mjs \u2014 node26-demo \u2014 Visual Studio Code<\/span><\/div>\n<div class=\"dd-vsc-tabs\">\n<label for=\"v2f1\" class=\"t1\"><b class=\"ic js\">JS<\/b>temporal-basics.mjs<\/label>\n<label for=\"v2r1\" class=\"run run1\" title=\"Show the output in the terminal\">\u25b6 Run<\/label>\n<\/div>\n<div class=\"dd-vsc-pane p1\">\n<div class=\"dd-vsc-crumbs\">node26-demo \u203a temporal-basics.mjs<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\">\/\/ temporal-basics.mjs - no import needed, Temporal is global in Node.js 26<\/span><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">due<\/span> = <span class=\"nb\">Temporal<\/span>.<span class=\"nc\">PlainDate<\/span>.<span class=\"k\">from<\/span>(<span class=\"s\">'2026-01-31'<\/span>).<span class=\"nf\">add<\/span>({ <span class=\"n\">months<\/span>: <span class=\"m\">1<\/span> });<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'One month after Jan 31:'<\/span>, <span class=\"n\">due<\/span>.<span class=\"nf\">toString<\/span>());<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"c\">\/\/ One meeting, many time zones<\/span><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">talk<\/span> = <span class=\"nb\">Temporal<\/span>.<span class=\"nc\">ZonedDateTime<\/span>.<span class=\"k\">from<\/span>(<span class=\"s\">'2026-11-07T19:00[Asia\/Kolkata]'<\/span>);<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'New York:'<\/span>, <span class=\"n\">talk<\/span>.<span class=\"nf\">withTimeZone<\/span>(<span class=\"s\">'America\/New_York'<\/span>).<span class=\"nf\">toString<\/span>());<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Tokyo:'<\/span>, <span class=\"n\">talk<\/span>.<span class=\"nf\">withTimeZone<\/span>(<span class=\"s\">'Asia\/Tokyo'<\/span>).<span class=\"nf\">toPlainTime<\/span>().<span class=\"nf\">toString<\/span>());<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"c\">\/\/ Count days between two dates<\/span><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">days<\/span> = <span class=\"nb\">Temporal<\/span>.<span class=\"nc\">PlainDate<\/span>.<span class=\"k\">from<\/span>(<span class=\"s\">'2026-11-07'<\/span>)<\/span>\n<span class=\"l\">  .<span class=\"nf\">until<\/span>(<span class=\"s\">'2027-01-26'<\/span>, { <span class=\"n\">largestUnit<\/span>: <span class=\"s\">'days'<\/span> });<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Days to Republic Day:'<\/span>, <span class=\"n\">days<\/span>.<span class=\"n\">days<\/span>);<\/span><\/code><\/pre>\n<div class=\"dd-vsc-term\"><div class=\"dd-term-head\"><span>TERMINAL<\/span><span>OUTPUT<\/span><span>PROBLEMS<\/span><span class=\"dd-term-note\">Real output (Temporal polyfill on Node.js 22) \u2013 built-in Temporal in Node.js 26 prints the same<\/span><\/div><pre><code><span class=\"gp\">$<\/span> node temporal-basics.mjs\nOne month after Jan 31: 2026-02-28\nNew York: 2026-11-07T08:30:00-05:00[America\/New_York]\nTokyo: 22:30:00\nDays to Republic Day: 80<\/code><\/pre><\/div>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 13, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>JavaScript<\/span><\/div>\n<\/div>\n<\/div>\n<p class=\"dd-vsc-hint\">Click \u25b6 Run to see the output.<\/p>\n<p>Notice that &#8220;one month after 31 January&#8221; gives 28 February, not a surprise date in March, and the New York time already uses winter time (UTC\u22125). For a full walkthrough, read our <a href=\"https:\/\/devdojo.co.in\/index.php\/2026\/10\/31\/javascript-temporal-api-tutorial\/\">JavaScript Temporal API tutorial<\/a>.<\/p>\n\n<h3>2. Map.getOrInsert() and Iterator.concat()<\/h3>\n<p>V8 14.6 brings two small helpers you will use every day. <code>map.getOrInsert(key, value)<\/code> returns the value for a key and inserts a default if the key is missing. <code>getOrInsertComputed(key, fn)<\/code> does the same but only runs <code>fn<\/code> when needed \u2013 perfect for grouping. Both also exist on <code>WeakMap<\/code>. <code>Iterator.concat()<\/code> joins arrays, sets and generators into one lazy iterator without copying them.<\/p>\n<div class=\"dd-vsc\" role=\"group\" aria-label=\"Code editor: word-count.mjs, iterator-concat.mjs\">\n<input type=\"radio\" name=\"v3\" id=\"v3f1\" class=\"f1\" checked>\n<input type=\"radio\" name=\"v3\" id=\"v3f2\" class=\"f2\">\n<input type=\"checkbox\" id=\"v3r1\" class=\"r1\">\n<input type=\"checkbox\" id=\"v3r2\" class=\"r2\">\n<div class=\"dd-vsc-bar\"><span class=\"dd-dots\"><i><\/i><i><\/i><i><\/i><\/span><span class=\"dd-vsc-title\">word-count.mjs \u2014 node26-demo \u2014 Visual Studio Code<\/span><\/div>\n<div class=\"dd-vsc-tabs\">\n<label for=\"v3f1\" class=\"t1\"><b class=\"ic js\">JS<\/b>word-count.mjs<\/label>\n<label for=\"v3f2\" class=\"t2\"><b class=\"ic js\">JS<\/b>iterator-concat.mjs<\/label>\n<label for=\"v3r1\" class=\"run run1\" title=\"Show the output in the terminal\">\u25b6 Run<\/label>\n<label for=\"v3r2\" class=\"run run2\" title=\"Show the output in the terminal\">\u25b6 Run<\/label>\n<\/div>\n<div class=\"dd-vsc-pane p1\">\n<div class=\"dd-vsc-crumbs\">node26-demo \u203a word-count.mjs<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\">\/\/ word-count.mjs - Map.getOrInsert() and getOrInsertComputed()<\/span><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">text<\/span> = <span class=\"s\">'node is fast node is stable node is lts'<\/span>;<\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">counts<\/span> = new <span class=\"nb\">Map<\/span>();<\/span>\n<span class=\"l\"><span class=\"k\">for<\/span> (<span class=\"kc\">const<\/span> <span class=\"n\">word<\/span> <span class=\"k\">of<\/span> <span class=\"n\">text<\/span>.<span class=\"nf\">split<\/span>(<span class=\"s\">' '<\/span>)) {<\/span>\n<span class=\"l\">  <span class=\"n\">counts<\/span>.<span class=\"nf\">set<\/span>(<span class=\"n\">word<\/span>, <span class=\"n\">counts<\/span>.<span class=\"nf\">getOrInsert<\/span>(<span class=\"n\">word<\/span>, <span class=\"m\">0<\/span>) + <span class=\"m\">1<\/span>);<\/span>\n<span class=\"l\">}<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"n\">counts<\/span>);<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"c\">\/\/ Group users by city - no more \"if (!map.has(key))\" checks<\/span><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">users<\/span> = [<\/span>\n<span class=\"l\">  { <span class=\"n\">name<\/span>: <span class=\"s\">'Asha'<\/span>, <span class=\"n\">city<\/span>: <span class=\"s\">'Pune'<\/span> },<\/span>\n<span class=\"l\">  { <span class=\"n\">name<\/span>: <span class=\"s\">'Ravi'<\/span>, <span class=\"n\">city<\/span>: <span class=\"s\">'Delhi'<\/span> },<\/span>\n<span class=\"l\">  { <span class=\"n\">name<\/span>: <span class=\"s\">'Meera'<\/span>, <span class=\"n\">city<\/span>: <span class=\"s\">'Pune'<\/span> },<\/span>\n<span class=\"l\">];<\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">byCity<\/span> = new <span class=\"nb\">Map<\/span>();<\/span>\n<span class=\"l\"><span class=\"k\">for<\/span> (<span class=\"kc\">const<\/span> <span class=\"n\">u<\/span> <span class=\"k\">of<\/span> <span class=\"n\">users<\/span>) {<\/span>\n<span class=\"l\">  <span class=\"n\">byCity<\/span>.<span class=\"nf\">getOrInsertComputed<\/span>(<span class=\"n\">u<\/span>.<span class=\"n\">city<\/span>, () =&gt; []).<span class=\"nf\">push<\/span>(<span class=\"n\">u<\/span>.<span class=\"n\">name<\/span>);<\/span>\n<span class=\"l\">}<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"n\">byCity<\/span>);<\/span><\/code><\/pre>\n<div class=\"dd-vsc-term\"><div class=\"dd-term-head\"><span>TERMINAL<\/span><span>OUTPUT<\/span><span>PROBLEMS<\/span><span class=\"dd-term-note\">Example output \u2013 Node.js 26 (not run on this page)<\/span><\/div><pre><code><span class=\"gp\">$<\/span> node word-count.mjs\nMap(5) {\n  'node' =&gt; 3,\n  'is' =&gt; 3,\n  'fast' =&gt; 1,\n  'stable' =&gt; 1,\n  'lts' =&gt; 1\n}\nMap(2) { 'Pune' =&gt; [ 'Asha', 'Meera' ], 'Delhi' =&gt; [ 'Ravi' ] }<\/code><\/pre><\/div>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 19, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>JavaScript<\/span><\/div>\n<\/div>\n<div class=\"dd-vsc-pane p2\">\n<div class=\"dd-vsc-crumbs\">node26-demo \u203a iterator-concat.mjs<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\">\/\/ iterator-concat.mjs - join several iterables lazily<\/span><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">fruits<\/span> = [<span class=\"s\">'apple'<\/span>, <span class=\"s\">'mango'<\/span>];<\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">veggies<\/span> = new <span class=\"nb\">Set<\/span>([<span class=\"s\">'carrot'<\/span>, <span class=\"s\">'peas'<\/span>]);<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"kc\">function<\/span>* <span class=\"nf\">snacks<\/span>() {<\/span>\n<span class=\"l\">  <span class=\"k\">yield<\/span> <span class=\"s\">'samosa'<\/span>;<\/span>\n<span class=\"l\">}<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"k\">for<\/span> (<span class=\"kc\">const<\/span> <span class=\"n\">item<\/span> <span class=\"k\">of<\/span> <span class=\"nb\">Iterator<\/span>.<span class=\"nf\">concat<\/span>(<span class=\"n\">fruits<\/span>, <span class=\"n\">veggies<\/span>, <span class=\"nf\">snacks<\/span>())) {<\/span>\n<span class=\"l\">  <span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"n\">item<\/span>);<\/span>\n<span class=\"l\">}<\/span><\/code><\/pre>\n<div class=\"dd-vsc-term\"><div class=\"dd-term-head\"><span>TERMINAL<\/span><span>OUTPUT<\/span><span>PROBLEMS<\/span><span class=\"dd-term-note\">Example output \u2013 Node.js 26 (not run on this page)<\/span><\/div><pre><code><span class=\"gp\">$<\/span> node iterator-concat.mjs\napple\nmango\ncarrot\npeas\nsamosa<\/code><\/pre><\/div>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 11, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>JavaScript<\/span><\/div>\n<\/div>\n<\/div>\n<p class=\"dd-vsc-hint\">Two files: click the tabs to switch, then \u25b6 Run on each.<\/p>\n<div class=\"dd-tip\"><strong>Tip:<\/strong> use <code>getOrInsertComputed()<\/code> when the default value is an object or array. With <code>getOrInsert(key, [])<\/code> a new empty array is created on every call, even when the key already exists.<\/div>\n\n<h3>3. Faster, newer fetch with Undici 8<\/h3>\n<p>The built-in <code>fetch()<\/code> is powered by the Undici library, and Node.js 26 ships Undici 8. Your normal <code>fetch<\/code> code keeps working; you mainly get bug fixes and better HTTP handling. If you import <code>undici<\/code> directly as a package, check its changelog because Undici 8 is a major version.<\/p>\n\n<h3>4. Smaller changes you may notice<\/h3>\n<ul>\n<li><strong>node:sqlite<\/strong> gets the Percentile extension, so you can use percentile functions in queries.<\/li>\n<li><strong>Crypto<\/strong> supports raw key formats in the <code>KeyObject<\/code> APIs and an Ed25519 context parameter.<\/li>\n<li><strong>assert<\/strong> error messages can now use printf-style placeholders such as <code>%s<\/code> and <code>%d<\/code>.<\/li>\n<li><code>QuotaExceededError<\/code> is now a <code>DOMException<\/code>, the same as in browsers.<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"dd-post\">\n<h2 id=\"from-node-25\">Features you also get from Node.js 25<\/h2>\n<p>Most teams jump from one LTS to the next, so if you come from Node.js 24 you also get everything that landed in Node.js 25. These are the most useful parts.<\/p>\n<h3>Uint8Array base64 and hex helpers<\/h3>\n<p>You no longer need <code>Buffer<\/code> (or a library) to turn bytes into base64 or hex. The same code now works in Node.js and in the browser.<\/p>\n<h3>localStorage on the server<\/h3>\n<p>Web Storage is enabled by default. To keep data between runs, give Node.js a file with <code>--localstorage-file<\/code>. In Node.js 26, if you do not pass a file, <code>localStorage<\/code> is simply <code>undefined<\/code> \u2013 so always check first, as the second file shows.<\/p>\n<div class=\"dd-vsc\" role=\"group\" aria-label=\"Code editor: base64.mjs, visits.mjs\">\n<input type=\"radio\" name=\"v4\" id=\"v4f1\" class=\"f1\" checked>\n<input type=\"radio\" name=\"v4\" id=\"v4f2\" class=\"f2\">\n<input type=\"checkbox\" id=\"v4r1\" class=\"r1\">\n<input type=\"checkbox\" id=\"v4r2\" class=\"r2\">\n<div class=\"dd-vsc-bar\"><span class=\"dd-dots\"><i><\/i><i><\/i><i><\/i><\/span><span class=\"dd-vsc-title\">base64.mjs \u2014 node26-demo \u2014 Visual Studio Code<\/span><\/div>\n<div class=\"dd-vsc-tabs\">\n<label for=\"v4f1\" class=\"t1\"><b class=\"ic js\">JS<\/b>base64.mjs<\/label>\n<label for=\"v4f2\" class=\"t2\"><b class=\"ic js\">JS<\/b>visits.mjs<\/label>\n<label for=\"v4r1\" class=\"run run1\" title=\"Show the output in the terminal\">\u25b6 Run<\/label>\n<label for=\"v4r2\" class=\"run run2\" title=\"Show the output in the terminal\">\u25b6 Run<\/label>\n<\/div>\n<div class=\"dd-vsc-pane p1\">\n<div class=\"dd-vsc-crumbs\">node26-demo \u203a base64.mjs<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\">\/\/ base64.mjs - Uint8Array base64 and hex helpers (no Buffer needed)<\/span><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">bytes<\/span> = new <span class=\"nf\">TextEncoder<\/span>().<span class=\"nf\">encode<\/span>(<span class=\"s\">'DevDojo'<\/span>);<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Base64:'<\/span>, <span class=\"n\">bytes<\/span>.<span class=\"nf\">toBase64<\/span>());<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Hex   :'<\/span>, <span class=\"n\">bytes<\/span>.<span class=\"nf\">toHex<\/span>());<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">decoded<\/span> = <span class=\"nb\">Uint8Array<\/span>.<span class=\"nf\">fromBase64<\/span>(<span class=\"s\">'SGVsbG8gTm9kZSAyNg=='<\/span>);<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Text  :'<\/span>, new <span class=\"nf\">TextDecoder<\/span>().<span class=\"nf\">decode<\/span>(<span class=\"n\">decoded<\/span>));<\/span><\/code><\/pre>\n<div class=\"dd-vsc-term\"><div class=\"dd-term-head\"><span>TERMINAL<\/span><span>OUTPUT<\/span><span>PROBLEMS<\/span><span class=\"dd-term-note\">Example output \u2013 Node.js 26 (not run on this page)<\/span><\/div><pre><code><span class=\"gp\">$<\/span> node base64.mjs\nBase64: RGV2RG9qbw==\nHex   : 446576446f6a6f\nText  : Hello Node 26<\/code><\/pre><\/div>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 7, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>JavaScript<\/span><\/div>\n<\/div>\n<div class=\"dd-vsc-pane p2\">\n<div class=\"dd-vsc-crumbs\">node26-demo \u203a visits.mjs<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\">\/\/ visits.mjs - browser-style localStorage, saved to a file<\/span><\/span>\n<span class=\"l\"><span class=\"k\">if<\/span> (typeof <span class=\"nb\">localStorage<\/span> === <span class=\"s\">'undefined'<\/span>) {<\/span>\n<span class=\"l\">  <span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Start Node with --localstorage-file=&lt;path&gt; to use localStorage'<\/span>);<\/span>\n<span class=\"l\">  <span class=\"nb\">process<\/span>.<span class=\"nf\">exit<\/span>(<span class=\"m\">1<\/span>);<\/span>\n<span class=\"l\">}<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">visits<\/span> = <span class=\"nb\">Number<\/span>(<span class=\"nb\">localStorage<\/span>.<span class=\"nf\">getItem<\/span>(<span class=\"s\">'visits'<\/span>) ?? <span class=\"m\">0<\/span>) + <span class=\"m\">1<\/span>;<\/span>\n<span class=\"l\"><span class=\"nb\">localStorage<\/span>.<span class=\"nf\">setItem<\/span>(<span class=\"s\">'visits'<\/span>, <span class=\"nb\">String<\/span>(<span class=\"n\">visits<\/span>));<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">`This script has run ${<\/span><span class=\"n\">visits<\/span><span class=\"s\">} time(s)`<\/span>);<\/span><\/code><\/pre>\n<div class=\"dd-vsc-term\"><div class=\"dd-term-head\"><span>TERMINAL<\/span><span>OUTPUT<\/span><span>PROBLEMS<\/span><span class=\"dd-term-note\">Example output \u2013 Node.js 26 (not run on this page)<\/span><\/div><pre><code><span class=\"gp\">$<\/span> node --localstorage-file=.\/app-storage visits.mjs\nThis script has run 1 time(s)\n$ node --localstorage-file=.\/app-storage visits.mjs\nThis script has run 2 time(s)<\/code><\/pre><\/div>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 9, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>JavaScript<\/span><\/div>\n<\/div>\n<\/div>\n<p class=\"dd-vsc-hint\">Click the tabs to switch files and \u25b6 Run to see the output.<\/p>\n<div class=\"dd-warn\"><strong>Careful:<\/strong> localStorage is handy for small scripts and CLIs, but it is synchronous and stores only strings. For a web server use a real database, such as PostgreSQL or SQLite.<\/div>\n<h3>Permission model with &#8211;allow-net<\/h3>\n<p>The permission model lets you lock a script down: with <code>--permission<\/code> on, Node.js blocks file system, child process, worker and \u2013 since Node.js 25 \u2013 network access unless you allow it. This is a great safety net for build scripts and tools you did not write yourself.<\/p>\n<div class=\"dd-vsc\" role=\"group\" aria-label=\"Code editor: read-config.mjs\">\n<input type=\"radio\" name=\"v5\" id=\"v5f1\" class=\"f1\" checked>\n<input type=\"checkbox\" id=\"v5r1\" class=\"r1\">\n<div class=\"dd-vsc-bar\"><span class=\"dd-dots\"><i><\/i><i><\/i><i><\/i><\/span><span class=\"dd-vsc-title\">read-config.mjs \u2014 node26-demo \u2014 Visual Studio Code<\/span><\/div>\n<div class=\"dd-vsc-tabs\">\n<label for=\"v5f1\" class=\"t1\"><b class=\"ic js\">JS<\/b>read-config.mjs<\/label>\n<label for=\"v5r1\" class=\"run run1\" title=\"Show the output in the terminal\">\u25b6 Run<\/label>\n<\/div>\n<div class=\"dd-vsc-pane p1\">\n<div class=\"dd-vsc-crumbs\">node26-demo \u203a read-config.mjs<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\">\/\/ read-config.mjs - try it with the permission model turned on<\/span><\/span>\n<span class=\"l\"><span class=\"k\">import<\/span> { <span class=\"n\">readFile<\/span> } <span class=\"k\">from<\/span> <span class=\"s\">'node:fs\/promises'<\/span>;<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Read .\/config.json?'<\/span>, <span class=\"nb\">process<\/span>.<span class=\"n\">permission<\/span>.<span class=\"nf\">has<\/span>(<span class=\"s\">'fs.read'<\/span>, <span class=\"s\">'.\/config.json'<\/span>));<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Read \/etc?'<\/span>, <span class=\"nb\">process<\/span>.<span class=\"n\">permission<\/span>.<span class=\"nf\">has<\/span>(<span class=\"s\">'fs.read'<\/span>, <span class=\"s\">'\/etc'<\/span>));<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Write files?'<\/span>, <span class=\"nb\">process<\/span>.<span class=\"n\">permission<\/span>.<span class=\"nf\">has<\/span>(<span class=\"s\">'fs.write'<\/span>));<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">config<\/span> = <span class=\"nb\">JSON<\/span>.<span class=\"nf\">parse<\/span>(<span class=\"k\">await<\/span> <span class=\"nf\">readFile<\/span>(<span class=\"s\">'.\/config.json'<\/span>, <span class=\"s\">'utf8'<\/span>));<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Loaded config for'<\/span>, <span class=\"n\">config<\/span>.<span class=\"n\">name<\/span>);<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"k\">try<\/span> {<\/span>\n<span class=\"l\">  <span class=\"k\">await<\/span> <span class=\"nb\">fetch<\/span>(<span class=\"s\">'https:\/\/example.com'<\/span>);<\/span>\n<span class=\"l\">} <span class=\"k\">catch<\/span> (<span class=\"n\">err<\/span>) {<\/span>\n<span class=\"l\">  <span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Network blocked:'<\/span>, <span class=\"n\">err<\/span>.<span class=\"n\">code<\/span> ?? <span class=\"n\">err<\/span>.<span class=\"n\">cause<\/span>?.<span class=\"n\">code<\/span>);<\/span>\n<span class=\"l\">}<\/span><\/code><\/pre>\n<div class=\"dd-vsc-term\"><div class=\"dd-term-head\"><span>TERMINAL<\/span><span>OUTPUT<\/span><span>PROBLEMS<\/span><span class=\"dd-term-note\">Example output \u2013 Node.js 26 (not run on this page)<\/span><\/div><pre><code><span class=\"gp\">$<\/span> node --permission --allow-fs-read=.\/ read-config.mjs\nRead .\/config.json? true\nRead \/etc? false\nWrite files? false\nLoaded config for demo-app\nNetwork blocked: ERR_ACCESS_DENIED<\/code><\/pre><\/div>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 15, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>JavaScript<\/span><\/div>\n<\/div>\n<\/div>\n<p class=\"dd-vsc-hint\">Click \u25b6 Run \u2013 notice which actions are allowed and which are blocked.<\/p>\n<p>Add <code>--allow-net<\/code> to let it use the network again, or <code>--allow-fs-write=.\/logs<\/code> to allow writing to one folder only.<\/p>\n<h3>Other Node.js 25 changes<\/h3>\n<ul>\n<li><code>ErrorEvent<\/code> is a global, like in browsers.<\/li>\n<li><code>JSON.stringify<\/code> is much faster for common objects.<\/li>\n<li>The compile cache can be made portable, which helps when you move a project folder or build in Docker.<\/li>\n<li><strong>Corepack is no longer included.<\/strong> If you use pnpm or Yarn through Corepack, install it yourself:<\/li>\n<\/ul>\n<div class=\"dd-vsc dd-vsc-termonly\" role=\"group\" aria-label=\"Terminal: Terminal \u2014 bring back pnpm \/ yarn\">\n<div class=\"dd-vsc-bar\"><span class=\"dd-dots\"><i><\/i><i><\/i><i><\/i><\/span><span class=\"dd-vsc-title\">Terminal \u2014 bring back pnpm \/ yarn<\/span><\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\"># Corepack is no longer shipped with Node.js (since v25)<\/span><\/span>\n<span class=\"l\"><span class=\"gp\">$<\/span> npm install -g corepack<\/span>\n<span class=\"l\"><span class=\"gp\">$<\/span> corepack enable<\/span>\n<span class=\"l\"><span class=\"gp\">$<\/span> pnpm -v<span class=\"c\">                 # pnpm \/ yarn work again<\/span><\/span><\/code><\/pre>\n<\/div>\n\n<h2 id=\"typescript\">Running TypeScript directly<\/h2>\n<p>Node.js can run <code>.ts<\/code> files directly by stripping the type annotations \u2013 no <code>tsc<\/code> or <code>ts-node<\/code> needed for simple apps. Node.js 26 removed the extra <code>--experimental-transform-types<\/code> flag, so only &#8220;erasable&#8221; TypeScript works: types, interfaces and <code>import type<\/code> are fine, but <code>enum<\/code>, <code>namespace<\/code> and parameter properties are not. The second file shows the simple replacement for an enum.<\/p>\n<div class=\"dd-vsc\" role=\"group\" aria-label=\"Code editor: server.ts, roles.ts\">\n<input type=\"radio\" name=\"v6\" id=\"v6f1\" class=\"f1\" checked>\n<input type=\"radio\" name=\"v6\" id=\"v6f2\" class=\"f2\">\n<input type=\"checkbox\" id=\"v6r1\" class=\"r1\">\n<input type=\"checkbox\" id=\"v6r2\" class=\"r2\">\n<div class=\"dd-vsc-bar\"><span class=\"dd-dots\"><i><\/i><i><\/i><i><\/i><\/span><span class=\"dd-vsc-title\">server.ts \u2014 node26-demo \u2014 Visual Studio Code<\/span><\/div>\n<div class=\"dd-vsc-tabs\">\n<label for=\"v6f1\" class=\"t1\"><b class=\"ic ts\">TS<\/b>server.ts<\/label>\n<label for=\"v6f2\" class=\"t2\"><b class=\"ic ts\">TS<\/b>roles.ts<\/label>\n<label for=\"v6r1\" class=\"run run1\" title=\"Show the output in the terminal\">\u25b6 Run<\/label>\n<label for=\"v6r2\" class=\"run run2\" title=\"Show the output in the terminal\">\u25b6 Run<\/label>\n<\/div>\n<div class=\"dd-vsc-pane p1\">\n<div class=\"dd-vsc-crumbs\">node26-demo \u203a server.ts<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\">\/\/ server.ts - run TypeScript directly, no build step<\/span><\/span>\n<span class=\"l\"><span class=\"k\">import<\/span> { <span class=\"n\">createServer<\/span>, <span class=\"k\">type<\/span> <span class=\"nc\">IncomingMessage<\/span>, <span class=\"k\">type<\/span> <span class=\"nc\">ServerResponse<\/span> } <span class=\"k\">from<\/span> <span class=\"s\">'node:http'<\/span>;<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"kc\">interface<\/span> <span class=\"nc\">Health<\/span> {<\/span>\n<span class=\"l\">  <span class=\"n\">status<\/span>: <span class=\"s\">'ok'<\/span>;<\/span>\n<span class=\"l\">  <span class=\"n\">node<\/span>: <span class=\"nc\">string<\/span>;<\/span>\n<span class=\"l\">  <span class=\"n\">uptime<\/span>: <span class=\"nc\">number<\/span>;<\/span>\n<span class=\"l\">}<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"kc\">function<\/span> <span class=\"nf\">health<\/span>(): <span class=\"nc\">Health<\/span> {<\/span>\n<span class=\"l\">  <span class=\"k\">return<\/span> { <span class=\"n\">status<\/span>: <span class=\"s\">'ok'<\/span>, <span class=\"n\">node<\/span>: <span class=\"nc\">process.version<\/span>, <span class=\"n\">uptime<\/span>: <span class=\"nc\">Math.round<\/span>(<span class=\"nb\">process<\/span>.<span class=\"nf\">uptime<\/span>()) };<\/span>\n<span class=\"l\">}<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"nf\">createServer<\/span>((<span class=\"n\">req<\/span>: <span class=\"nc\">IncomingMessage<\/span>, <span class=\"n\">res<\/span>: <span class=\"nc\">ServerResponse<\/span>) =&gt; {<\/span>\n<span class=\"l\">  <span class=\"n\">res<\/span>.<span class=\"nf\">writeHead<\/span>(<span class=\"m\">200<\/span>, { <span class=\"s\">'content-type'<\/span>: <span class=\"s\">'application\/json'<\/span> });<\/span>\n<span class=\"l\">  <span class=\"n\">res<\/span>.<span class=\"nf\">end<\/span>(<span class=\"nb\">JSON<\/span>.<span class=\"nf\">stringify<\/span>(<span class=\"nf\">health<\/span>()));<\/span>\n<span class=\"l\">}).<span class=\"nf\">listen<\/span>(<span class=\"m\">3000<\/span>, () =&gt; <span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Listening on http:\/\/localhost:3000'<\/span>));<\/span><\/code><\/pre>\n<div class=\"dd-vsc-term\"><div class=\"dd-term-head\"><span>TERMINAL<\/span><span>OUTPUT<\/span><span>PROBLEMS<\/span><span class=\"dd-term-note\">Example output \u2013 Node.js 26 (not run on this page)<\/span><\/div><pre><code><span class=\"gp\">$<\/span> node server.ts\nListening on http:\/\/localhost:3000<\/code><\/pre><\/div>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 17, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>TypeScript<\/span><\/div>\n<\/div>\n<div class=\"dd-vsc-pane p2\">\n<div class=\"dd-vsc-crumbs\">node26-demo \u203a roles.ts<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\">\/\/ roles.ts - enums need a build step, so use a plain object instead<\/span><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"nc\">Role<\/span> = {<\/span>\n<span class=\"l\">  <span class=\"nc\">Admin<\/span>: <span class=\"s\">'admin'<\/span>,<\/span>\n<span class=\"l\">  <span class=\"nc\">User<\/span>: <span class=\"s\">'user'<\/span>,<\/span>\n<span class=\"l\">} <span class=\"k\">as<\/span> <span class=\"kc\">const<\/span>;<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"k\">type<\/span> <span class=\"nc\">Role<\/span> = (typeof <span class=\"nc\">Role<\/span>)[<span class=\"n\">keyof<\/span> typeof <span class=\"nc\">Role<\/span>];<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"kc\">function<\/span> <span class=\"nf\">canDelete<\/span>(<span class=\"n\">role<\/span>: <span class=\"nc\">Role<\/span>): <span class=\"nc\">boolean<\/span> {<\/span>\n<span class=\"l\">  <span class=\"k\">return<\/span> <span class=\"n\">role<\/span> === <span class=\"nc\">Role<\/span>.<span class=\"nc\">Admin<\/span>;<\/span>\n<span class=\"l\">}<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'admin can delete?'<\/span>, <span class=\"nf\">canDelete<\/span>(<span class=\"nc\">Role<\/span>.<span class=\"nc\">Admin<\/span>));<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'user can delete?'<\/span>, <span class=\"nf\">canDelete<\/span>(<span class=\"nc\">Role<\/span>.<span class=\"nc\">User<\/span>));<\/span><\/code><\/pre>\n<div class=\"dd-vsc-term\"><div class=\"dd-term-head\"><span>TERMINAL<\/span><span>OUTPUT<\/span><span>PROBLEMS<\/span><span class=\"dd-term-note\">Example output \u2013 Node.js 26 (not run on this page)<\/span><\/div><pre><code><span class=\"gp\">$<\/span> node roles.ts\nadmin can delete? true\nuser can delete? false<\/code><\/pre><\/div>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 14, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>TypeScript<\/span><\/div>\n<\/div>\n<\/div>\n<p class=\"dd-vsc-hint\">Click the tabs to see both TypeScript files, then \u25b6 Run.<\/p>\n<p>Node.js does not type-check your code \u2013 it only removes the types. Keep running <code>tsc --noEmit<\/code> (or the new fast compiler from our <a href=\"https:\/\/devdojo.co.in\/index.php\/2026\/10\/07\/typescript-7-migration-guide\/\">TypeScript 7 migration guide<\/a>) in CI to catch type errors.<\/p>\n<\/div>\n\n\n\n<div class=\"dd-post\">\n<h2 id=\"breaking-changes\">Breaking changes and how to fix them<\/h2>\n<p>Most apps upgrade without code changes. Still, a few old APIs were finally removed. Here is the old code and the fixed version side by side.<\/p>\n<div class=\"dd-vsc\" role=\"group\" aria-label=\"Code editor: old-code.mjs, fixed-code.mjs\">\n<input type=\"radio\" name=\"v7\" id=\"v7f1\" class=\"f1\" checked>\n<input type=\"radio\" name=\"v7\" id=\"v7f2\" class=\"f2\">\n<input type=\"checkbox\" id=\"v7r2\" class=\"r2\">\n<div class=\"dd-vsc-bar\"><span class=\"dd-dots\"><i><\/i><i><\/i><i><\/i><\/span><span class=\"dd-vsc-title\">old-code.mjs \u2014 legacy-app \u2014 Visual Studio Code<\/span><\/div>\n<div class=\"dd-vsc-tabs\">\n<label for=\"v7f1\" class=\"t1\"><b class=\"ic js\">JS<\/b>old-code.mjs<\/label>\n<label for=\"v7f2\" class=\"t2\"><b class=\"ic js\">JS<\/b>fixed-code.mjs<\/label>\n<label for=\"v7r2\" class=\"run run2\" title=\"Show the output in the terminal\">\u25b6 Run<\/label>\n<\/div>\n<div class=\"dd-vsc-pane p1\">\n<div class=\"dd-vsc-crumbs\">legacy-app \u203a old-code.mjs<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\">\/\/ old-code.mjs - worked on Node.js 24, breaks on Node.js 26<\/span><\/span>\n<span class=\"l\"><span class=\"k\">import<\/span> <span class=\"n\">fs<\/span> <span class=\"k\">from<\/span> <span class=\"s\">'node:fs'<\/span>;<\/span>\n<span class=\"l\"><span class=\"k\">import<\/span> <span class=\"n\">http<\/span> <span class=\"k\">from<\/span> <span class=\"s\">'node:http'<\/span>;<\/span>\n<span class=\"l\"><span class=\"k\">import<\/span> { <span class=\"n\">createRequire<\/span> } <span class=\"k\">from<\/span> <span class=\"s\">'node:module'<\/span>;<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">require<\/span> = <span class=\"nf\">createRequire<\/span>(<span class=\"k\">import<\/span>.<span class=\"n\">meta<\/span>.<span class=\"n\">url<\/span>);<\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"nc\">Readable<\/span> = <span class=\"nf\">require<\/span>(<span class=\"s\">'_stream_readable'<\/span>);      <span class=\"c\">\/\/ removed in Node.js 26<\/span><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> { <span class=\"nc\">SlowBuffer<\/span> } = <span class=\"nf\">require<\/span>(<span class=\"s\">'node:buffer'<\/span>);      <span class=\"c\">\/\/ end-of-life since Node.js 25<\/span><\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"n\">fs<\/span>.<span class=\"nf\">access<\/span>(<span class=\"s\">'.\/app.log'<\/span>, <span class=\"n\">fs<\/span>.<span class=\"nc\">F_OK<\/span>, (<span class=\"n\">err<\/span>) =&gt; {         <span class=\"c\">\/\/ fs.F_OK removed in Node.js 25<\/span><\/span>\n<span class=\"l\">  <span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"n\">err<\/span> ? <span class=\"s\">'app.log missing'<\/span> : <span class=\"s\">'app.log found'<\/span>);<\/span>\n<span class=\"l\">});<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"n\">http<\/span>.<span class=\"nf\">createServer<\/span>((<span class=\"n\">req<\/span>, <span class=\"n\">res<\/span>) =&gt; {<\/span>\n<span class=\"l\">  <span class=\"n\">res<\/span>.<span class=\"nf\">writeHeader<\/span>(<span class=\"m\">200<\/span>, { <span class=\"s\">'content-type'<\/span>: <span class=\"s\">'text\/plain'<\/span> }); <span class=\"c\">\/\/ removed in Node.js 26<\/span><\/span>\n<span class=\"l\">  <span class=\"n\">res<\/span>.<span class=\"nf\">end<\/span>(<span class=\"s\">'ok'<\/span>);<\/span>\n<span class=\"l\">});<\/span><\/code><\/pre>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 17, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>JavaScript<\/span><\/div>\n<\/div>\n<div class=\"dd-vsc-pane p2\">\n<div class=\"dd-vsc-crumbs\">legacy-app \u203a fixed-code.mjs<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\">\/\/ fixed-code.mjs - the same logic, ready for Node.js 26<\/span><\/span>\n<span class=\"l\"><span class=\"k\">import<\/span> <span class=\"n\">fs<\/span> <span class=\"k\">from<\/span> <span class=\"s\">'node:fs'<\/span>;<\/span>\n<span class=\"l\"><span class=\"k\">import<\/span> <span class=\"n\">http<\/span> <span class=\"k\">from<\/span> <span class=\"s\">'node:http'<\/span>;<\/span>\n<span class=\"l\"><span class=\"k\">import<\/span> { <span class=\"nc\">Readable<\/span> } <span class=\"k\">from<\/span> <span class=\"s\">'node:stream'<\/span>;<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">big<\/span> = <span class=\"nb\">Buffer<\/span>.<span class=\"nf\">allocUnsafeSlow<\/span>(<span class=\"m\">1024<\/span>);           <span class=\"c\">\/\/ instead of new SlowBuffer(1024)<\/span><\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Buffer size:'<\/span>, <span class=\"n\">big<\/span>.<span class=\"n\">length<\/span>);<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Readable is a'<\/span>, typeof <span class=\"nc\">Readable<\/span>);<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"n\">fs<\/span>.<span class=\"nf\">access<\/span>(<span class=\"s\">'.\/app.log'<\/span>, <span class=\"n\">fs<\/span>.<span class=\"n\">constants<\/span>.<span class=\"nc\">F_OK<\/span>, (<span class=\"n\">err<\/span>) =&gt; {<\/span>\n<span class=\"l\">  <span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"n\">err<\/span> ? <span class=\"s\">'app.log missing'<\/span> : <span class=\"s\">'app.log found'<\/span>);<\/span>\n<span class=\"l\">});<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"kc\">const<\/span> <span class=\"n\">server<\/span> = <span class=\"n\">http<\/span>.<span class=\"nf\">createServer<\/span>((<span class=\"n\">req<\/span>, <span class=\"n\">res<\/span>) =&gt; {<\/span>\n<span class=\"l\">  <span class=\"n\">res<\/span>.<span class=\"nf\">writeHead<\/span>(<span class=\"m\">200<\/span>, { <span class=\"s\">'content-type'<\/span>: <span class=\"s\">'text\/plain'<\/span> });<\/span>\n<span class=\"l\">  <span class=\"n\">res<\/span>.<span class=\"nf\">end<\/span>(<span class=\"s\">'ok'<\/span>);<\/span>\n<span class=\"l\">});<\/span>\n<span class=\"l\"><span class=\"nb\">console<\/span>.<span class=\"nf\">log<\/span>(<span class=\"s\">'Server created:'<\/span>, <span class=\"n\">server<\/span> instanceof <span class=\"n\">http<\/span>.<span class=\"nc\">Server<\/span>);<\/span><\/code><\/pre>\n<div class=\"dd-vsc-term\"><div class=\"dd-term-head\"><span>TERMINAL<\/span><span>OUTPUT<\/span><span>PROBLEMS<\/span><span class=\"dd-term-note\">Real output (Node.js 22.23 \u2013 this fixed code runs the same on Node.js 26)<\/span><\/div><pre><code><span class=\"gp\">$<\/span> node fixed-code.mjs\nBuffer size: 1024\nReadable is a function\nServer created: true\napp.log missing<\/code><\/pre><\/div>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 18, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>JavaScript<\/span><\/div>\n<\/div>\n<\/div>\n<p class=\"dd-vsc-hint\">Compare the two tabs: the first one breaks on Node.js 26, the second one is the fix. \u25b6 Run is on the fixed file.<\/p>\n<div class=\"dd-tablewrap\"><table>\n<thead><tr><th>Removed or changed<\/th><th>Since<\/th><th>Use instead<\/th><\/tr><\/thead>\n<tbody>\n<tr><td><code>res.writeHeader()<\/code><\/td><td>26<\/td><td><code>res.writeHead()<\/code><\/td><\/tr>\n<tr><td><code>_stream_readable<\/code>, <code>_stream_writable<\/code>, <code>_stream_duplex<\/code>, <code>_stream_transform<\/code>, <code>_stream_passthrough<\/code>, <code>_stream_wrap<\/code><\/td><td>26<\/td><td><code>import { Readable, Writable, \u2026 } from 'node:stream'<\/code><\/td><\/tr>\n<tr><td><code>--experimental-transform-types<\/code><\/td><td>26<\/td><td>Erasable TypeScript only, or build with <code>tsc<\/code><\/td><\/tr>\n<tr><td><code>module.register()<\/code><\/td><td>26 (deprecated)<\/td><td><code>module.registerHooks()<\/code><\/td><\/tr>\n<tr><td><code>fs.F_OK<\/code>, <code>fs.R_OK<\/code>, <code>fs.W_OK<\/code>, <code>fs.X_OK<\/code><\/td><td>25<\/td><td><code>fs.constants.F_OK<\/code> and friends<\/td><\/tr>\n<tr><td><code>SlowBuffer<\/code><\/td><td>25<\/td><td><code>Buffer.allocUnsafeSlow()<\/code><\/td><\/tr>\n<tr><td>Corepack in the installer<\/td><td>25<\/td><td><code>npm install -g corepack<\/code><\/td><\/tr>\n<tr><td>Native addons (bcrypt, sharp, \u2026)<\/td><td>26<\/td><td><code>npm rebuild<\/code> or update to a version with Node 26 binaries<\/td><\/tr>\n<tr><td>Code that checks <code>if (!globalThis.Temporal)<\/code><\/td><td>26<\/td><td>Test it \u2013 your polyfill is now skipped and the built-in one is used<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p>The full list is in the official <a href=\"https:\/\/nodejs.org\/en\/blog\/release\/v26.0.0\" rel=\"noopener\" target=\"_blank\">Node.js 26.0.0 release notes<\/a>.<\/p>\n<\/div>\n\n\n\n<div class=\"dd-post\">\n<h2 id=\"upgrade\">How to upgrade to Node.js 26 step by step<\/h2>\n<figure>\n<svg viewBox=\"0 0 900 240\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Five-step Node.js 26 upgrade flow: check, install, fix, test, ship\">\n<defs><linearGradient id=\"flac\" x1=\"0\" y1=\"0\" x2=\"1\" y2=\"0\"><stop offset=\"0\" stop-color=\"#3178c6\"\/><stop offset=\"1\" stop-color=\"#7c5cff\"\/><\/linearGradient><\/defs>\n<rect width=\"900\" height=\"240\" rx=\"14\" fill=\"#0b1020\"\/>\n<text x=\"20\" y=\"42\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"18\" font-weight=\"800\" fill=\"#fff\">Safe upgrade flow<\/text>\n<path id=\"flp\" d=\"M98 200 H802\" stroke=\"#3a4380\" stroke-width=\"3\" stroke-dasharray=\"8 8\"\/>\n<circle r=\"8\" fill=\"#89e051\"><animateMotion dur=\"4s\" repeatCount=\"indefinite\"><mpath href=\"#flp\"\/><\/animateMotion><\/circle>\n<g class=\"node\"><rect x=\"20\" y=\"70\" width=\"156\" height=\"110\" rx=\"14\" fill=\"#151b3b\" stroke=\"#3178c6\" stroke-width=\"2\"\/><circle cx=\"48\" cy=\"98\" r=\"15\" fill=\"url(#flac)\"\/><text x=\"48\" y=\"103\" text-anchor=\"middle\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"14\" font-weight=\"800\" fill=\"#fff\">1<\/text><text x=\"72\" y=\"104\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"18\" font-weight=\"800\" fill=\"#fff\">Check<\/text><text x=\"34\" y=\"146\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12.5\" fill=\"#aab4e8\">node -v, changelog<\/text><\/g><g class=\"node\"><rect x=\"196\" y=\"70\" width=\"156\" height=\"110\" rx=\"14\" fill=\"#151b3b\" stroke=\"#7c5cff\" stroke-width=\"2\"\/><circle cx=\"224\" cy=\"98\" r=\"15\" fill=\"url(#flac)\"\/><text x=\"224\" y=\"103\" text-anchor=\"middle\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"14\" font-weight=\"800\" fill=\"#fff\">2<\/text><text x=\"248\" y=\"104\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"18\" font-weight=\"800\" fill=\"#fff\">Install<\/text><text x=\"210\" y=\"146\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12.5\" fill=\"#aab4e8\">nvm install 26, .nvmrc<\/text><\/g><g class=\"node\"><rect x=\"372\" y=\"70\" width=\"156\" height=\"110\" rx=\"14\" fill=\"#151b3b\" stroke=\"#3178c6\" stroke-width=\"2\"\/><circle cx=\"400\" cy=\"98\" r=\"15\" fill=\"url(#flac)\"\/><text x=\"400\" y=\"103\" text-anchor=\"middle\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"14\" font-weight=\"800\" fill=\"#fff\">3<\/text><text x=\"424\" y=\"104\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"18\" font-weight=\"800\" fill=\"#fff\">Fix<\/text><text x=\"386\" y=\"146\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12.5\" fill=\"#aab4e8\">removed APIs, flags<\/text><\/g><g class=\"node\"><rect x=\"548\" y=\"70\" width=\"156\" height=\"110\" rx=\"14\" fill=\"#151b3b\" stroke=\"#7c5cff\" stroke-width=\"2\"\/><circle cx=\"576\" cy=\"98\" r=\"15\" fill=\"url(#flac)\"\/><text x=\"576\" y=\"103\" text-anchor=\"middle\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"14\" font-weight=\"800\" fill=\"#fff\">4<\/text><text x=\"600\" y=\"104\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"18\" font-weight=\"800\" fill=\"#fff\">Test<\/text><text x=\"562\" y=\"146\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12.5\" fill=\"#aab4e8\">npm rebuild, npm test<\/text><\/g><g class=\"node\"><rect x=\"724\" y=\"70\" width=\"156\" height=\"110\" rx=\"14\" fill=\"#151b3b\" stroke=\"#3178c6\" stroke-width=\"2\"\/><circle cx=\"752\" cy=\"98\" r=\"15\" fill=\"url(#flac)\"\/><text x=\"752\" y=\"103\" text-anchor=\"middle\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"14\" font-weight=\"800\" fill=\"#fff\">5<\/text><text x=\"776\" y=\"104\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"18\" font-weight=\"800\" fill=\"#fff\">Ship<\/text><text x=\"738\" y=\"146\" font-family=\"Segoe UI,Arial,sans-serif\" font-size=\"12.5\" fill=\"#aab4e8\">CI and Docker<\/text><\/g>\n<\/svg>\n<figcaption>Upgrade in small steps: check what you run today, install 26 next to it, fix removed APIs, test, then ship through CI and Docker.<\/figcaption>\n<\/figure>\n<p>Choose where you are coming from to see your checklist:<\/p>\n<div class=\"dd-tabs\" role=\"group\" aria-label=\"Upgrade checklist by current version\">\n<input type=\"radio\" name=\"up\" id=\"ti1\" checked><input type=\"radio\" name=\"up\" id=\"ti2\"><input type=\"radio\" name=\"up\" id=\"ti3\">\n<div class=\"labels\"><label for=\"ti1\">From Node.js 24<\/label><label for=\"ti2\">From Node.js 22<\/label><label for=\"ti3\">From Node.js 20<\/label><\/div>\n<div class=\"panel p1\"><ul>\n<li>Search your code for <code>writeHeader(<\/code> and <code>_stream_<\/code>.<\/li>\n<li>Replace <code>fs.F_OK<\/code>-style constants with <code>fs.constants.*<\/code>.<\/li>\n<li>Install Corepack yourself if you use pnpm or Yarn.<\/li>\n<li>Run <code>npm rebuild<\/code> for native addons.<\/li>\n<li>Expected effort: <strong>under an hour<\/strong> for most apps.<\/li>\n<\/ul><\/div>\n<div class=\"panel p2\"><ul>\n<li>Everything in the &#8220;From Node.js 24&#8221; tab.<\/li>\n<li>Remove old workarounds for loading ES modules with <code>require()<\/code> \u2013 it works without a flag in every supported version.<\/li>\n<li>Update test tools: the built-in <code>node --test<\/code> runner is much more complete than in 22.<\/li>\n<li>Upgrade big dependencies (Express, Prisma, Jest\/Vitest) to their latest major first.<\/li>\n<li>Expected effort: <strong>half a day to a day<\/strong>.<\/li>\n<\/ul><\/div>\n<div class=\"panel p3\"><ul>\n<li>Node.js 20 gets no security fixes \u2013 treat this as urgent.<\/li>\n<li>Do it in two hops: 20 \u2192 22 (run tests) \u2192 26. Smaller steps make errors easier to find.<\/li>\n<li>Expect old packages that pin <code>engines.node<\/code> to &#8220;20.x&#8221; to warn; update them.<\/li>\n<li>Review OpenSSL-related crypto code, as several old crypto options have reached end of life.<\/li>\n<li>Expected effort: <strong>one to a few days<\/strong>, depending on test coverage.<\/li>\n<\/ul><\/div>\n<\/div>\n<h3>Step 1\u20134: install, pin and test locally<\/h3>\n<div class=\"dd-vsc dd-vsc-termonly\" role=\"group\" aria-label=\"Terminal: Terminal \u2014 upgrade to Node.js 26\">\n<div class=\"dd-vsc-bar\"><span class=\"dd-dots\"><i><\/i><i><\/i><i><\/i><\/span><span class=\"dd-vsc-title\">Terminal \u2014 upgrade to Node.js 26<\/span><\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\"># 1. Install Node.js 26 with nvm (macOS, Linux, WSL)<\/span><\/span>\n<span class=\"l\"><span class=\"gp\">$<\/span> nvm install 26<\/span>\n<span class=\"l\"><span class=\"gp\">$<\/span> nvm use 26<\/span>\n<span class=\"l\"><span class=\"gp\">$<\/span> nvm alias default 26<span class=\"c\">     # new terminals use 26 too<\/span><\/span>\n<span class=\"l\"><span class=\"gp\">$<\/span> node -v<\/span>\n<span class=\"l\"><span class=\"c\"># 2. Pin the version for your whole team<\/span><\/span>\n<span class=\"l\"><span class=\"gp\">$<\/span> echo \"26\" &gt; .nvmrc<\/span>\n<span class=\"l\"><span class=\"c\"># 3. Clean install and rebuild native addons<\/span><\/span>\n<span class=\"l\"><span class=\"gp\">$<\/span> npm ci<\/span>\n<span class=\"l\"><span class=\"gp\">$<\/span> npm rebuild<\/span>\n<span class=\"l\"><span class=\"c\"># 4. Run your tests and print where each deprecation comes from<\/span><\/span>\n<span class=\"l\"><span class=\"gp\">$<\/span> NODE_OPTIONS=\"--trace-deprecation\" npm test<\/span><\/code><\/pre>\n<\/div>\n<p><code>--trace-deprecation<\/code> prints a stack trace for every deprecation warning, so you can see exactly which file (or which package) uses an old API.<\/p>\n<h3>Step 5: update package.json, CI and Docker<\/h3>\n<p>Tell everyone \u2013 and every machine \u2013 to use the new version. The GitHub Actions matrix tests Node.js 24 and 26 side by side, so you can merge with confidence. Learn more in our <a href=\"https:\/\/devdojo.co.in\/index.php\/2026\/10\/06\/github-actions-ci-cd-nodejs\/\">GitHub Actions CI\/CD for Node.js guide<\/a> and <a href=\"https:\/\/devdojo.co.in\/index.php\/2026\/10\/10\/docker-compose-tutorial\/\">Docker Compose tutorial<\/a>.<\/p>\n<div class=\"dd-vsc\" role=\"group\" aria-label=\"Code editor: package.json, ci.yml, Dockerfile\">\n<input type=\"radio\" name=\"v8\" id=\"v8f1\" class=\"f1\" checked>\n<input type=\"radio\" name=\"v8\" id=\"v8f2\" class=\"f2\">\n<input type=\"radio\" name=\"v8\" id=\"v8f3\" class=\"f3\">\n<div class=\"dd-vsc-bar\"><span class=\"dd-dots\"><i><\/i><i><\/i><i><\/i><\/span><span class=\"dd-vsc-title\">package.json \u2014 demo-app \u2014 Visual Studio Code<\/span><\/div>\n<div class=\"dd-vsc-tabs\">\n<label for=\"v8f1\" class=\"t1\"><b class=\"ic json\">{}<\/b>package.json<\/label>\n<label for=\"v8f2\" class=\"t2\"><b class=\"ic yml\">YML<\/b>ci.yml<\/label>\n<label for=\"v8f3\" class=\"t3\"><b class=\"ic dk\">DK<\/b>Dockerfile<\/label>\n<\/div>\n<div class=\"dd-vsc-pane p1\">\n<div class=\"dd-vsc-crumbs\">demo-app \u203a package.json<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\">{<\/span>\n<span class=\"l\">  <span class=\"n\">\"name\"<\/span>: <span class=\"s\">\"demo-app\"<\/span>,<\/span>\n<span class=\"l\">  <span class=\"n\">\"version\"<\/span>: <span class=\"s\">\"1.0.0\"<\/span>,<\/span>\n<span class=\"l\">  <span class=\"n\">\"type\"<\/span>: <span class=\"s\">\"module\"<\/span>,<\/span>\n<span class=\"l\">  <span class=\"n\">\"engines\"<\/span>: {<\/span>\n<span class=\"l\">    <span class=\"n\">\"node\"<\/span>: <span class=\"s\">\"&gt;=26\"<\/span><\/span>\n<span class=\"l\">  },<\/span>\n<span class=\"l\">  <span class=\"n\">\"scripts\"<\/span>: {<\/span>\n<span class=\"l\">    <span class=\"n\">\"start\"<\/span>: <span class=\"s\">\"node server.ts\"<\/span>,<\/span>\n<span class=\"l\">    <span class=\"n\">\"test\"<\/span>: <span class=\"s\">\"node --test\"<\/span><\/span>\n<span class=\"l\">  }<\/span>\n<span class=\"l\">}<\/span><\/code><\/pre>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 12, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>JSON<\/span><\/div>\n<\/div>\n<div class=\"dd-vsc-pane p2\">\n<div class=\"dd-vsc-crumbs\">demo-app \u203a ci.yml<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\"># .github\/workflows\/ci.yml<\/span><\/span>\n<span class=\"l\"><span class=\"n\">name<\/span>: CI<\/span>\n<span class=\"l\"><span class=\"n\">on<\/span>: [<span class=\"n\">push<\/span>, <span class=\"n\">pull_request<\/span>]<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"n\">jobs<\/span>:<\/span>\n<span class=\"l\">  <span class=\"n\">test<\/span>:<\/span>\n<span class=\"l\">    <span class=\"n\">runs-on<\/span>: ubuntu-latest<\/span>\n<span class=\"l\">    <span class=\"n\">strategy<\/span>:<\/span>\n<span class=\"l\">      <span class=\"n\">matrix<\/span>:<\/span>\n<span class=\"l\">        <span class=\"n\">node<\/span>: [<span class=\"n\">24<\/span>, <span class=\"n\">26<\/span>]   <span class=\"c\"># test old and new LTS side by side<\/span><\/span>\n<span class=\"l\">    <span class=\"n\">steps<\/span>:<\/span>\n<span class=\"l\">      - <span class=\"n\">uses<\/span>: actions\/checkout@v4<\/span>\n<span class=\"l\">      - <span class=\"n\">uses<\/span>: actions\/setup-node@v4<\/span>\n<span class=\"l\">        <span class=\"n\">with<\/span>:<\/span>\n<span class=\"l\">          <span class=\"n\">node-version<\/span>: ${{ matrix.node }}<\/span>\n<span class=\"l\">          <span class=\"n\">cache<\/span>: npm<\/span>\n<span class=\"l\">      - <span class=\"n\">run<\/span>: npm ci<\/span>\n<span class=\"l\">      - <span class=\"n\">run<\/span>: npm test<\/span><\/code><\/pre>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 18, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>YAML<\/span><\/div>\n<\/div>\n<div class=\"dd-vsc-pane p3\">\n<div class=\"dd-vsc-crumbs\">demo-app \u203a Dockerfile<\/div>\n<pre class=\"dd-vsc-code\"><code><span class=\"l\"><span class=\"c\"># Dockerfile<\/span><\/span>\n<span class=\"l\"><span class=\"k\">FROM<\/span> <span class=\"s\">node:26-slim<\/span><\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"k\">WORKDIR<\/span> <span class=\"s\">\/app<\/span><\/span>\n<span class=\"l\"><span class=\"k\">COPY<\/span> package*.json .\/<\/span>\n<span class=\"l\"><span class=\"k\">RUN<\/span> npm ci --omit=dev<\/span>\n<span class=\"l\"><span class=\"k\">COPY<\/span> . .<\/span>\n<span class=\"l\"><\/span>\n<span class=\"l\"><span class=\"k\">USER<\/span> <span class=\"s\">node<\/span><\/span>\n<span class=\"l\"><span class=\"k\">EXPOSE<\/span> <span class=\"s\">3000<\/span><\/span>\n<span class=\"l\"><span class=\"k\">CMD<\/span> [<span class=\"s\">\"node\"<\/span>, <span class=\"s\">\"server.ts\"<\/span>]<\/span><\/code><\/pre>\n<div class=\"dd-vsc-status\"><span>\u2387 main<\/span><span>Ln 11, Col 1<\/span><span class=\"sp\"><\/span><span>Spaces: 2<\/span><span>UTF-8<\/span><span>LF<\/span><span>Dockerfile<\/span><\/div>\n<\/div>\n<\/div>\n<p class=\"dd-vsc-hint\">Three config files that tell your team, CI and Docker to use Node.js 26 \u2013 click the tabs.<\/p>\n<p>Want to understand the <code>engines<\/code> field and lock files better? See <a href=\"https:\/\/devdojo.co.in\/index.php\/2026\/11\/06\/nodejs-series-part-3-npm-package-json\/\">npm and package.json: Installing and Managing Packages<\/a>.<\/p>\n<\/div>\n\n\n\n<div class=\"dd-post\">\n<h2 id=\"errors\">Common errors and fixes<\/h2>\n<div class=\"dd-tablewrap\"><table>\n<thead><tr><th>Error message<\/th><th>Why it happens<\/th><th>Fix<\/th><\/tr><\/thead>\n<tbody>\n<tr><td><code>TypeError: res.writeHeader is not a function<\/code><\/td><td>The old alias was removed in Node.js 26.<\/td><td>Use <code>res.writeHead()<\/code>.<\/td><\/tr>\n<tr><td><code>Cannot find module '_stream_readable'<\/code><\/td><td>Internal stream modules were removed.<\/td><td>Import from <code>node:stream<\/code>. If it comes from a package, update the package.<\/td><\/tr>\n<tr><td><code>The module was compiled against a different Node.js version \u2026 NODE_MODULE_VERSION<\/code><\/td><td>A native addon was built for an older Node.js.<\/td><td>Delete <code>node_modules<\/code>, run <code>npm ci<\/code>, then <code>npm rebuild<\/code>.<\/td><\/tr>\n<tr><td><code>ERR_UNSUPPORTED_TYPESCRIPT_SYNTAX<\/code><\/td><td>You used <code>enum<\/code> or <code>namespace<\/code> in a <code>.ts<\/code> file run directly.<\/td><td>Use an <code>as const<\/code> object, or compile with <code>tsc<\/code>.<\/td><\/tr>\n<tr><td><code>bad option: --experimental-transform-types<\/code><\/td><td>The flag was removed.<\/td><td>Remove it from scripts and <code>NODE_OPTIONS<\/code>.<\/td><\/tr>\n<tr><td><code>pnpm: command not found<\/code><\/td><td>Corepack is no longer bundled.<\/td><td><code>npm install -g corepack &amp;&amp; corepack enable<\/code><\/td><\/tr>\n<tr><td><code>localStorage is not defined<\/code> \/ <code>undefined<\/code><\/td><td>No storage file was given.<\/td><td>Start Node.js with <code>--localstorage-file=.\/path<\/code>.<\/td><\/tr>\n<\/tbody><\/table><\/div>\n\n<h2 id=\"best-practices\">Best practices for Node.js 26 LTS<\/h2>\n<ul>\n<li><strong>Pin the major, not the patch.<\/strong> Use <code>26<\/code> in <code>.nvmrc<\/code> and <code>node:26-slim<\/code> in Docker so you get security patches automatically.<\/li>\n<li><strong>Test two versions in CI<\/strong> during the move (24 and 26), then drop 24 once production is stable.<\/li>\n<li><strong>Upgrade staging first<\/strong> and watch memory and response times for a few days before production.<\/li>\n<li><strong>Prefer built-ins:<\/strong> Temporal instead of moment\/dayjs for new code, <code>Uint8Array.toBase64()<\/code> instead of small base64 libraries, <code>node --test<\/code> for simple test suites.<\/li>\n<li><strong>Use the permission model<\/strong> for scripts that run third-party code, such as build tools.<\/li>\n<li><strong>Read the changelog<\/strong> of packages with native code (bcrypt, sharp, canvas) and wait for Node 26 support if they have none yet.<\/li>\n<\/ul>\n\n<h2 id=\"faq\">FAQ<\/h2>\n<details><summary>Is Node.js 26 LTS ready for production?<\/summary><p>Yes. Once a release reaches LTS, the Node.js team treats it as production-ready and only adds safe fixes. Many teams wait for the first LTS release (26.13.0) and then upgrade \u2013 that point has now arrived.<\/p><\/details>\n<details><summary>When does Node.js 26 support end?<\/summary><p>Node.js LTS lines get about 30 months of support in total, which puts the end of Node.js 26 at around April 2029. Check the official releases page for the exact date.<\/p><\/details>\n<details><summary>Should I upgrade from Node.js 24 right now?<\/summary><p>There is no rush \u2013 Node.js 24 is still supported. But start testing on 26 now, so you can switch calmly in the next few months instead of in a hurry later.<\/p><\/details>\n<details><summary>Do I still need a Temporal polyfill?<\/summary><p>Not on Node.js 26. You may still need it for older Node.js versions or for browsers you support. Keep the polyfill only where your code actually runs on those older platforms.<\/p><\/details>\n<details><summary>Can I run TypeScript in production with node file.ts?<\/summary><p>You can for simple apps that only use erasable syntax. Many teams still compile to JavaScript for production to get type checking and faster start-up, and use direct <code>.ts<\/code> running for scripts and development.<\/p><\/details>\n<details><summary>What is the LTS code name used for?<\/summary><p>Every LTS line gets a name of a chemical element (Iron, Jod, Krypton, Lithium). You will see it in <code>process.release.lts<\/code> and in Docker tags like <code>node:lithium<\/code>.<\/p><\/details>\n\n<h2 id=\"conclusion\">Conclusion<\/h2>\n<p>Node.js 26 LTS is a calm, solid upgrade: Temporal finally fixes dates, small helpers like <code>getOrInsert()<\/code> and <code>Uint8Array.toBase64()<\/code> remove boilerplate, and the permission model now covers the network. The breaking changes are few and easy to find with <code>--trace-deprecation<\/code>. Install it next to your current version today, run your tests, and move your production apps over in the coming weeks.<\/p>\n<div class=\"dd-cta\"><h3>New posts every day on DevDojo<\/h3><p>Practical, beginner-friendly tutorials on AI, frontend, backend and DevOps \u2013 with code you can run. Learning Node.js from scratch? Follow our free <a href=\"https:\/\/devdojo.co.in\/index.php\/2026\/10\/23\/nodejs-series-part-1-what-is-nodejs\/\">Node.js series<\/a>.<\/p><\/div>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Node.js 26 LTS is here. Learn the new features like Temporal, Map.getOrInsert and localStorage, the breaking changes, and how to upgrade safely, step by step.<\/p>\n","protected":false},"author":1,"featured_media":299,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,20,8],"tags":[83,162,43,161,144,163],"class_list":["post-300","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-backend","category-javascript","category-nodejs","tag-javascript","tag-lts","tag-node-js","tag-node-js-26","tag-temporal-api","tag-upgrade-guide"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"Node.js 26 LTS is here. 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