Node.js 22 vs 24 (2026): npm v11 is 65% Faster — Worth Upgrading?

Node.js 24 shipped npm v11 — 65% faster installs than v10. It updated V8 to add Float16Array and RegExp.escape(), tightened fetch() compliance, and promoted native TypeScript type-stripping to stable. Node.js 22 is still in active LTS, supported until April 2027. If you're starting a new project in 2026, the choice is clear — but upgrading existing applications requires understanding what breaks.

TL;DR

Node.js 24 for new projects — it's LTS as of October 2025, includes npm v11, a more capable V8 engine, and stable native TypeScript support. Node.js 22 remains valid for production applications that need a proven, stable platform through April 2027. If you're maintaining a Node.js 22 app, plan the upgrade path to 24 — but there's no emergency. If you're starting fresh, Node.js 24 is the right foundation.

Key Takeaways

• Node.js 22: LTS since April 2024, active support until April 2026, maintenance until April 2027
• Node.js 24: LTS since October 2025, active support until October 2027, maintenance until April 2028
• Node.js 24: npm v11 (65% faster large installs vs v10)
• Node.js 24: V8 13.4 — Float16Array, RegExp.escape(), improved performance
• Node.js 22: Native TypeScript support (--strip-types) introduced as experimental
• Node.js 24: Native TypeScript support stable (--strip-types enabled by default for .ts files)
• Node.js 24: Breaking changes — OpenSSL 3.5 security level 2 default, stricter fetch(), Buffer changes

LTS Release Timeline

Node.js follows a predictable LTS cadence: even-numbered releases become LTS, odd-numbered are Current (non-LTS).

Node.js 22: April 2024 → LTS October 2024 → End of Life April 2027
Node.js 23: October 2024 → Current (no LTS) → EOL June 2025
Node.js 24: May 2025 → LTS October 2025 → End of Life April 2028
Node.js 25: October 2025 → Current (no LTS) → EOL June 2026
Node.js 26: April 2026 → LTS October 2026 → End of Life April 2029

For production applications: stay on LTS. Skip odd-numbered releases entirely unless you need bleeding-edge features.

Node.js 22 Features (Recap)

Node.js 22 was a significant LTS release focused on ESM maturity and developer productivity.

require() for ES Modules

The long-awaited fix: synchronous require() for ESM files works reliably.

// Before Node.js 22: This would fail or require --experimental-vm-modules
const { something } = require('./my-esm-module.mjs');

// Node.js 22+: Works without flags
const { something } = require('./esm-module.mjs');

This eliminated a major compatibility headache when mixing CJS and ESM in the same project.

// What this unlocks:
// 1. Use ESM-only packages (chalk v5, globby, execa, etc.) directly in CJS code
// 2. Migrate to ESM incrementally — no need to rewrite everything at once
// 3. Eliminate async import() wrapper functions just to load a package

// Before Node.js 22 (verbose async workaround):
async function loadChalk() {
  const { default: chalk } = await import('chalk');
  return chalk;
}

// Node.js 22+ (direct require works):
const chalk = require('chalk');
console.log(chalk.blue('Hello!'));

Dual package hazard: Some popular packages — like chalk v5, execa, got, and globby — ship as ESM-only. Before Node.js 22, requiring these in a CommonJS project forced teams to either pin to the last CJS version (chalk v4) or convert their entire project to ESM. With require() for ESM available in Node.js 22+, the dual package hazard is largely resolved for runtime loading. If you have pinned chalk to v4 or execa to v5 specifically to stay CJS-compatible, Node.js 22+ lets you unpin those dependencies:

// Node.js 22+: ESM-only packages work via require()
const { Chalk } = require('chalk');    // chalk v5 (ESM-only)
const { execa } = require('execa');    // execa v9 (ESM-only)
const { got } = require('got');        // got v14 (ESM-only)
const { globby } = require('globby'); // globby v14 (ESM-only)

Real-World Impact

The stabilization of require(esm) is the most consequential interoperability change in years, and its impact is broader than the obvious "you can now require chalk v5" headline. The deeper value is that it eliminates an entire category of dual-package maintenance that library authors have wrestled with since ESM became the default for many modern npm packages.

With require(esm) stable in v24, library authors targeting Node.js 24+ can publish ESM-only and trust that both CJS and ESM consumers can use their package. For greenfield Node.js 24 projects, the ESM ecosystem (chalk, execa, got, p-limit, globby, and dozens of other Sindre Sorhus-authored packages that dropped CJS support in major versions) is now fully accessible without converting your entire codebase to ESM.

The practical upgrade sequence for existing Node.js 22 codebases: first, update your engines field and .nvmrc, deploy to Node.js 24, and verify nothing breaks (most things won't). Then, in a second pass, clean up async import workarounds: find patterns like const { default: x } = await import('esm-only-package') wrapping synchronous usage and replace them with direct require() calls. This cleanup isn't urgent but reduces cognitive overhead in codebases that accumulated many such workarounds.

One edge case to audit: packages that export both CJS and ESM and use module-level side effects (global state initialization, prototype patching) may behave differently when loaded via require(esm) versus the old CJS build. The module will execute as ESM, which has different handling of top-level this (it's undefined, not the global object) and async top-level code. For well-written libraries this isn't an issue, but it's worth running your test suite specifically against packages with complex initialization.

WebSocket Client (Built-In)

// Node.js 22: Built-in WebSocket client — no ws or socket.io needed for client usage
const ws = new WebSocket('wss://example.com/socket');

ws.addEventListener('open', () => {
  ws.send('Hello!');
});

ws.addEventListener('message', ({ data }) => {
  console.log('Received:', data);
});

No npm install ws needed for client-side WebSocket connections.

Native TypeScript Support (Experimental)

# Node.js 22.18+ (experimental)
node --experimental-strip-types src/script.ts

Type annotations are stripped at runtime using V8's built-in parser — no transpilation, no type checking, just type erasure. Decorators and complex TypeScript syntax not supported in this mode.

Stream Performance

The default high watermark for streams increased from 16 KB to 65 KB, improving throughput for file I/O and HTTP streaming without code changes.

Task Runner (--run flag)

# Run npm scripts without npm run prefix
node --run build   # Equivalent to npm run build
node --run test    # Equivalent to npm run test

Node.js 24 Features

npm v11

npm v11 ships with Node.js 24 — the biggest day-to-day improvement for most developers:

# npm v11 — 65% faster large installs
npm install  # significantly faster for large projects

# npm v11 improvements:
# - Faster package resolution
# - Improved workspace support
# - Better peerDependency handling
# - Updated lockfile format

# Check your npm version
node -v   # v24.x.x
npm -v    # 11.x.x

V8 13.4 — New JavaScript Features

// Float16Array — new typed array for 16-bit floating point
const arr = new Float16Array(4);
arr[0] = 3.14;
console.log(arr[0]); // 3.140625 (nearest float16 value)

// RegExp.escape() — safely escape strings for use in RegExp
const userInput = 'Hello (World)!';
const pattern = new RegExp(RegExp.escape(userInput));
console.log(pattern.test('Hello (World)!')); // true
// Without escape: '(' would break the regex

// Iterator helpers
const iter = [1, 2, 3, 4, 5].values();
const doubled = iter.map(x => x * 2).take(3);
console.log([...doubled]); // [2, 4, 6]

// Array.fromAsync() — build arrays from async iterables
async function* asyncRange(n) {
  for (let i = 0; i < n; i++) yield i;
}
const nums = await Array.fromAsync(asyncRange(5));
console.log(nums); // [0, 1, 2, 3, 4]

// Promise.try() — wraps sync throws as rejections (instead of uncaught exceptions)
const result = await Promise.try(() => {
  if (Math.random() > 0.5) throw new Error('oops');
  return 'ok';
});
// Sync throws are caught and become rejected Promises — no try/catch needed

// Explicit resource management — deterministic cleanup with 'await using'
async function processFile(path) {
  await using handle = await fs.promises.open(path, 'r');
  // handle.close() is called automatically when the block exits, even on throw
  return await handle.readFile('utf8');
}

Stable Native TypeScript Support

Node.js 22 introduced --experimental-strip-types; Node.js 24 promotes it to stable:

// script.ts
const name: string = 'World';
const greet = (who: string): string => `Hello, ${who}!`;
console.log(greet(name));

# Node.js 24: works without flags for .ts files
node script.ts
# Hello, World!

Limitations remain:

• No type checking (types are stripped, not verified)
• No TypeScript transformations (enums, decorators need --experimental-transform-types)
• For full TypeScript: still use tsx or Bun

Built-in glob() and rimraf()

// Node.js 22.6+, stabilized in 24: built-in glob
import { glob } from 'node:fs';

// Find all TypeScript files
const tsFiles = [];
for await (const file of glob('**/*.ts', { exclude: ['node_modules/**'] })) {
  tsFiles.push(file);
}
console.log(tsFiles);

// Node.js 24: rimraf-like recursive delete
import { rm } from 'node:fs/promises';
await rm('./dist', { recursive: true, force: true });
// No rimraf package needed

Stricter fetch() Compliance

Node.js 24 tightened fetch() to match the WHATWG Fetch specification:

// Node.js 22: fetch with non-standard options worked silently
// Node.js 24: throws TypeError for invalid options

// This may break existing code:
const response = await fetch(url, {
  // Some non-standard options that Node.js 22 ignored but Node.js 24 rejects
});

Check your fetch() usage if upgrading — particularly around credentials, CORS modes, and custom headers.

OpenSSL 3.5 Security Level 2

Node.js 24 uses OpenSSL 3.5 with security level 2 as the default:

// Node.js 24 rejects these:
// - RSA/DSA/DH keys shorter than 2048 bits
// - ECC keys shorter than 224 bits
// - MD5, SHA-1 in signatures

// If your app connects to servers with legacy TLS configurations:
// You may see: Error: routines:ssl_choose_client_version:unsupported protocol

For most modern applications, this change is invisible. For legacy integrations, you may need to update server certificates or TLS configuration.

Permission Model Improvements

# Node.js 24: more granular permissions
node --experimental-permission \
  --allow-fs-read=/home/user/data \
  --allow-net=api.example.com \
  script.ts

The permission model lets you run scripts with minimal capabilities — similar to Deno's permission system.

// Check permissions programmatically before attempting access:
const { permission } = require('node:process');

if (!permission.has('fs.read', '/etc/passwd')) {
  throw new Error('No permission to read /etc/passwd');
}

try {
  const data = fs.readFileSync('/etc/sensitive');
} catch (err) {
  if (err.code === 'ERR_ACCESS_DENIED') {
    console.log('Permission denied by Node.js permission model');
  }
}

Security framing — blast radius reduction: The primary use case is running minimally-trusted code (user-provided scripts, third-party CLI tools, dynamic plugins) with a limited blast radius. A script that should only read /tmp can be denied access to /etc, network sockets, or child processes. Without the permission model, a compromised or malicious npm package can exfiltrate credentials, spawn subprocesses, or make outbound requests to attacker-controlled servers. The permission model makes process-level isolation possible without the overhead of spinning up a separate container or VM. It's most effective for scripts with clear, bounded I/O — a data-processing job that reads one directory and writes to another is an ideal candidate.

Breaking Changes: What Breaks on Node.js 24

Upgrade Path

Testing Before Upgrading

# Use nvm to test both versions:
nvm install 24
nvm use 24
npm install  # Regenerates lockfile with npm v11
npm test     # Run your test suite

For CI, run both versions in parallel before committing to the bump:

# .github/workflows/node-compat.yml
strategy:
  matrix:
    node-version: [22, 24]
steps:
  - uses: actions/setup-node@v4
    with:
      node-version: ${{ matrix.node-version }}
  - run: npm ci
  - run: npm test

This parallel matrix approach lets you validate Node.js 24 compatibility without changing your production version — useful when you're managing multiple services and want confidence before a fleet-wide bump.

Common Issues and Fixes

# Run community compatibility scanner before upgrading
npx @nodecompat/check .  # Community tool for compatibility checks

This tool scans your project for patterns known to break on Node.js 24 and reports them with line-level detail — useful before running a full test suite.

// 1. fetch() options — check for non-standard usage
// Replace any custom mode/credentials that aren't spec-compliant

// 2. Old crypto keys — update any RSA < 2048 or EC < 224 configs
const { generateKeyPair } = require('crypto');
generateKeyPair('rsa', { modulusLength: 2048 }, callback); // OK
// generateKeyPair('rsa', { modulusLength: 1024 }, ...) // Fails in v24

// 3. URL.parse() callers — update error-handling to check for null
// v22: URL.parse('not a url') throws
// v24: URL.parse('not a url') returns null
const parsed = URL.parse(userInput);
if (!parsed) { /* handle invalid URL */ }

// 4. npm lockfile — regenerate and commit
rm package-lock.json
npm install  # Generates npm v11 lockfile
git add package-lock.json

Migration Checklist

# 1. Update .nvmrc / .node-version:
echo "24" > .nvmrc

# 2. Update package.json engines:
# "engines": { "node": ">=24.0.0" }

# 3. Update CI (GitHub Actions):
# - uses: actions/setup-node@v4
#   with:
#     node-version: '24'

# 4. Check for breaking changes:
npx @nodecompat/check .  # Community tool for compatibility checks

# 5. Remove workarounds now unnecessary in Node.js 24:
# - Remove async import() workarounds for ESM packages (use require() directly)
# - Remove --experimental-fetch flag from startup scripts
# - Remove custom fetch polyfills (undici, node-fetch)

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Node.js 22 vs Node.js 24 Comparison

Which Version to Use in 2026

New projects: Node.js 24. It's LTS, more capable, and starts you on the longer support timeline (2028 vs 2027).

Existing Node.js 22 projects: No urgency to upgrade immediately. Node.js 22 has active support through April 2026 and maintenance through April 2027. Test on Node.js 24 when convenient, target upgrading before April 2026.

Docker/CI: Update your base images:

# Before
FROM node:22-alpine

# After (Node.js 24 LTS)
FROM node:24-alpine

Package authors: Test against both Node.js 22 and 24 in CI. Add "engines": { "node": ">=22" } to your package.json to be explicit about minimum support.

Ecosystem & Community

The Node.js project's release cadence and LTS commitment have made it one of the most dependable runtimes in the server-side JavaScript ecosystem. The Node.js Release Working Group maintains clear timelines and communicates breaking changes well in advance, which is why major version upgrades have become increasingly low-drama events for most production applications.

The npm v11 improvement deserves more attention than it typically gets in version announcements. Install speed is a daily friction point for every Node.js developer. A 65% improvement on large projects translates to measurable time savings in CI pipelines — projects with thousands of dependencies that previously took 90 seconds to install can now complete in under 35 seconds. This compounds over thousands of CI runs per month. Several engineering teams have reported CI cost reductions after upgrading to Node.js 24 simply because the reduced install time means faster parallelization and lower compute costs.

The JavaScript runtime ecosystem has also become more competitive in 2026. Bun and Deno have both released production-stable versions with compelling performance characteristics and developer experience improvements. Node.js 24's native TypeScript support is a direct response to Bun and Deno's first-class TypeScript support, acknowledging that the ecosystem has moved past requiring compilation as a workflow step for many use cases.

Real-World Adoption

The enterprise adoption of Node.js 24 has been brisk compared to previous LTS cycles. Several factors contributed: the upgrade path from Node.js 22 is genuinely smooth for most applications, the npm v11 performance improvement is immediately tangible, and the TypeScript stabilization addresses a workflow pain point that has driven some teams toward alternative runtimes.

Cloud providers have updated their managed Node.js offerings quickly. AWS Lambda, Google Cloud Functions, and Azure Functions all added Node.js 24 runtime support within weeks of its LTS designation. This rapid platform support reduces the operational risk of upgrading, since you're not betting on your cloud provider catching up.

Container-based deployments (Kubernetes, Docker Compose) benefit immediately from smaller base images and faster build times. The node:24-alpine image is well-maintained and widely used. Organizations running dozens or hundreds of microservices see cumulative CI savings that justify the upgrade effort even when individual services would be fine staying on Node.js 22.

Developer Experience Deep Dive

The native TypeScript support in Node.js 24 deserves a nuanced assessment. It's genuinely useful for scripts, tooling, and simple server code. Being able to run node script.ts without any configuration or build step is convenient, especially for quick prototyping and internal tools. The performance is excellent because type stripping is essentially free — it's a lexical transformation, not a compilation.

However, the limitations are real for production applications. No type checking means you don't get the safety guarantees that are the primary reason most teams adopt TypeScript. Decorators (used heavily in NestJS, TypeORM, and class-based validation libraries) require --experimental-transform-types which remains unstable. Path aliases and project references don't work without additional tooling.

The practical advice for most teams: use tsx or the TypeScript compiler for development and production TypeScript execution. Use Node.js 24's native TypeScript support for ad-hoc scripts and tooling where the overhead of setting up a proper TypeScript build pipeline isn't justified.

The built-in glob() API is a quiet quality-of-life improvement. The glob package has been one of the most commonly installed development dependencies in the Node.js ecosystem for years. Having it available without installation reduces dependency count and removes a small but perennial point of confusion for new Node.js developers.

Performance & Benchmarks

The V8 13.4 upgrade brings measurable performance improvements across several dimensions. Benchmark comparisons between Node.js 22 and 24 show 8-15% improvement in compute-intensive workloads, with the greatest gains in modern JavaScript patterns like iterator helpers and generators.

The HTTP throughput and startup improvements are the most impactful for production workloads. A 15% throughput gain means the same hardware handles roughly one-sixth more concurrent requests. The -33% GC pause reduction benefits latency-sensitive applications — p99 tail latency improves for services that previously experienced periodic GC spikes.

For applications that are I/O-bound (database queries, external API calls) rather than CPU-bound, the npm install speed gains remain the most day-to-day impactful change. Memory RSS reduction of 7% translates to meaningful savings in containerized deployments where you're paying per MB of RAM.

The 65% npm install speed improvement shows up immediately in practice. A project with 500 production dependencies previously taking 60 seconds to install completes in roughly 22 seconds with npm v11. A monorepo with 2,000 total dependencies that previously took 3 minutes to install can complete in under 70 seconds.

Security Improvements in Node.js 24

The permission model in Node.js 24 represents a meaningful shift in how the runtime can be used to limit the blast radius of security vulnerabilities. Passing --allow-fs-read=/app/data and --allow-fs-write=/tmp to a Node.js process creates a hard constraint that even a successfully exploited vulnerability in a dependency cannot violate — the process simply lacks the kernel permission to read /etc/passwd or write to /app even if malicious code executes.

# Scope a script to specific filesystem paths only
node --allow-fs-read=/app/data --allow-fs-write=/tmp process-files.js

# Allow specific child processes only
node --allow-child-process=git,npm build.js

// Programmatic permission check before attempting access
const { permission } = require('node:process');

if (!permission.has('fs.read', '/etc/passwd')) {
  throw new Error('No permission to read /etc/passwd');
}

This is similar in spirit to what seccomp filters provide at the syscall level, but expressed in a developer-friendly flag format that can be added to npm scripts and Dockerfile CMD instructions without requiring sysadmin expertise. The practical use case for most developers is not protecting against active exploits but auditing: running your build tools with restrictive permissions surfaces hidden filesystem access by dependencies that was previously invisible.

For production web servers that run in containers with OS-level isolation already, the permission model is secondary — the container boundary covers the same threat. The permission model shines for scripts and CI tools that process untrusted input: file processors, code generators, and dev tools where you want explicit scoping to specific filesystem paths.

Migration Guide

Most Node.js 22 applications will upgrade to Node.js 24 without code changes. The practical checklist:

First, update your .nvmrc, .node-version, or Dockerfile to specify Node.js 24. Run your full test suite. If tests pass without changes, you're done with the code changes.

Second, delete and regenerate your package-lock.json to create the npm v11 format lockfile. The new format is not backward compatible with npm v10, so commit it to source control and ensure your team's local environments are also on Node.js 24 before doing so to avoid lockfile conflicts.

Third, audit any fetch() calls that use non-standard options. Review your TLS/SSL configurations for legacy certificate compatibility. Neither issue is common in modern applications but both have caused upgrade failures in organizations with older infrastructure.

Fourth, review your CI and deployment configurations. Update Docker base images, Lambda runtime selections, and any Node.js version specifications in CI configuration files.

Finally, run your application in a staging environment on Node.js 24 for at least a few days before promoting to production. This catches any runtime behavior changes that automated tests might miss.

What Node.js 24 Doesn't Replace

TypeScript: Native --strip-types strips type annotations at runtime — it doesn't type-check. A type error won't prevent execution; it silently succeeds. For production TypeScript with type safety guarantees, tsc --noEmit in CI and a build pipeline (tsup, esbuild) remain essential. Decorators, enums-as-values, and path aliases still require tsx or tsc.

WebSocket servers: The built-in WebSocket is client-only. Building a WebSocket server still requires the ws package or a framework integration (@fastify/websocket, hono/ws). The native client's value is browser-API compatibility — the same connection code runs in both browsers and Node.js without polyfills.

Container isolation: The permission model is powerful for scripts and build tooling with bounded I/O. Production web servers in Docker or Kubernetes already get OS-level isolation from the container boundary — permission flags add defense-in-depth but don't replace container security practices.

Final Verdict 2026

Node.js 24 is a solid, conservative upgrade from Node.js 22. It doesn't introduce a dramatic paradigm shift — it's Node.js 22 with meaningful improvements in tooling speed, V8 capabilities, and TypeScript workflow ergonomics. For new projects, it's clearly the right choice. For existing Node.js 22 projects, plan your upgrade before April 2026 when Node.js 22 moves from active to maintenance status.

The npm v11 speed improvement alone is worth the upgrade for any team that runs Node.js in CI environments. The compounded savings over time make the upgrade ROI positive even accounting for the testing and verification effort required.

Node.js 24 and the JavaScript Runtime Competition

The upgrade from Node.js 22 to 24 happens against a backdrop of increased runtime competition. Bun and Deno have both matured significantly, and the features that once differentiated them — native TypeScript, faster startup, built-in test runners — are now appearing in Node.js itself. Node.js 24's stable TypeScript stripping, built-in glob() and file utilities, and the improved permission model are all responses to this competitive pressure.

For the vast majority of server-side JavaScript development, Node.js remains the dominant choice due to ecosystem compatibility and cloud platform support. Every major cloud function platform (AWS Lambda, Google Cloud Functions, Azure Functions, Cloudflare Workers) added Node.js 24 support quickly, while Bun and Deno runtime support is available but less mature on managed platforms. Organizations with large existing Node.js codebases have almost no reason to switch runtimes in 2026 — the improvements in Node.js 24 address the workflow pain points that motivated runtime switching in the first place.

The npm v11 improvement deserves particular attention for monorepo teams. Projects using pnpm workspaces or Yarn Berry have had a speed advantage over npm for several years. npm v11's architecture changes close that gap significantly. For organizations that standardized on npm (rather than pnpm or bun) for ecosystem simplicity, upgrading to Node.js 24 and getting npm v11 is the path of least resistance to faster installs.

TypeScript Strategy After Node.js 24

Node.js 24's stable TypeScript support changes the development workflow calculus for backend TypeScript projects. The previous recommended stack — ts-node for development, tsc for type checking, tsup for production builds — simplifies in 2026. With native TypeScript stripping, ts-node is replaced by Node.js itself. The node --watch src/index.ts command provides the development server loop without any additional dependencies. Type checking via tsc --noEmit remains essential and is unchanged. Production builds via tsup or esbuild remain the right choice for bundled output.

This simplification is most meaningful for teams building Node.js utilities, CLIs, and internal tooling. For web applications with JSX, a bundler is still required. For NestJS applications using decorators, --experimental-transform-types is needed. But for the large middle-ground of Express, Fastify, or Hono APIs written in plain TypeScript, Node.js 24 eliminates a setup step that has historically caused friction for new developers. See best JavaScript runtimes 2026 for how Node.js 24 compares to Bun and Deno on the full runtime feature set.

Testing Your Application Against Node.js 24

Before committing to the upgrade in production, a systematic testing approach reduces risk. For applications with comprehensive test suites, running the test suite against Node.js 24 covers the majority of compatibility surface area. For applications with gaps in test coverage, focusing manual testing on areas involving fetch(), crypto operations, and stream behavior addresses the most common Node.js 24 breaking change categories.

Using Docker multi-stage builds to test both Node.js 22 and 24 in CI before committing to the version bump is a low-overhead approach. Add a parallel CI stage that runs your test suite against Node.js 24 before actually changing your primary Node.js version. This gives you confidence that the upgrade is safe without requiring you to maintain both versions in production simultaneously. For teams managing multiple microservices, migrating services one at a time (starting with lower-criticality services) is the safest approach. The 20 fastest growing npm packages 2026 report tracks which packages have already updated their engines field to support Node.js 24, useful for identifying any dependency compatibility risks.

The most common CI failures when first adding Node.js 24 to the matrix: native addons compiled with node-gyp must be recompiled for each major version (node-gyp rebuild against the new V8 headers), packages with strict engines fields that reject Node.js 24, and subtle behavior changes in built-in modules. The engines field issue is often transitive — your direct dependencies may support Node.js 24 but pull in a deep transitive dependency that still requires "node": ">=16 <24". Running npx check-node-version --node ">= 24" in CI surfaces these mismatches before they become production surprises.

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