Node.js vs Deno vs Bun: The 2026 Runtime Comparison
·PkgPulse Team
0
TL;DR
Node.js 22 LTS for production workloads; Bun for new projects where performance matters; Deno for security-first or Deno Deploy use cases. The runtime wars are over — all three are production-capable. Node.js wins on ecosystem completeness and battle-tested stability. Bun wins on raw performance and developer experience. Deno wins on security defaults and integrated tooling. The practical choice: use Bun if you're starting fresh and your team is performance-focused; Node.js 22 if you're risk-averse or have existing Node.js infrastructure.
Key Takeaways
- Bun performance: ~3x faster than Node.js on HTTP, ~10x faster installs
- Node.js stability: 15+ years, 99%+ npm compat, every hosting platform supports it
- Deno 2.0: finally supports npm packages natively — the compatibility gap is closed
- Compatibility: Node.js 100%; Bun ~95% (native addons, some edge cases); Deno ~90%
- Tooling: Bun has a bundler + test runner + package manager built-in; Deno has all-in-one too
Philosophy Differences
Node.js (2009):
→ C++ + V8 + libuv (async I/O)
→ npm/CommonJS ecosystem from the start
→ Backwards compatibility as a core value
→ "If it worked in v16, it works in v22"
→ Ships without bundler, formatter, test runner — you choose your tools
Deno (2018):
→ TypeScript by default (no config needed)
→ URL-based imports (no node_modules traditionally)
→ Deno 2.0: npm compatibility added, import maps standardized
→ Permission model: explicit grants for file, network, env access
→ Built-in: formatter, linter, test runner, bundler, LSP
Bun (2022):
→ Written in Zig (not C++) — from scratch for speed
→ JavaScriptCore engine (Safari's engine, not V8)
→ Drop-in Node.js replacement goal
→ Built-in: package manager (fastest), bundler, test runner, transpiler
→ Web-first APIs (fetch, WebSocket, etc.) built-in
→ "Everything fast by default"
Performance: The Numbers
# HTTP server benchmark (hello world):
# ApacheBench: 10K requests, concurrency 100
Runtime req/s p99 latency Memory
─────────────────────────────────────────────────────
Bun 1.x (native) 120,000 2.1ms 35MB
Deno 2.0 89,000 2.8ms 42MB
Node.js 22 (uws) 95,000 2.5ms 40MB
Node.js 22 (http) 52,000 3.8ms 45MB
Node.js 22 (express) 28,000 5.2ms 58MB
# File I/O (read 10K files):
Bun: 1.2s 🏆
Deno: 2.1s
Node.js: 2.8s
# Package install (fresh Next.js project, 162 packages):
Bun install: ~3s 🏆
pnpm install: ~14s
npm install: ~45s
Deno (npm): ~12s (comparable to pnpm)
# Test runner (500 unit tests):
Bun test: 0.8s 🏆
Vitest: 2.1s
Jest: 8.4s
Deno test: 1.9s
# TypeScript transpile (no type-check):
Bun: ~immediate (native, no separate step)
Deno: ~immediate (native, no separate step)
Node.js: requires ts-node/tsx/swc/esbuild ~100ms+
Node.js 22: What's New
// 1. require(ESM) — the long-awaited feature
// Node.js 22.12+ LTS: can require() ES modules!
// Previously: ERR_REQUIRE_ESM forced messy workarounds
const esModule = require('./my-esm-module.mjs');
// Works in Node.js 22.12+ without flags
// Huge for: legacy CJS codebases consuming modern ESM-only packages
// 2. Native WebSocket client (no ws package needed)
const ws = new WebSocket('wss://echo.example.com');
ws.onmessage = (event) => console.log(event.data);
// 3. node:sqlite (experimental, Node.js 22.5+)
import { DatabaseSync } from 'node:sqlite';
const db = new DatabaseSync('./data.db');
db.exec('CREATE TABLE IF NOT EXISTS users (id INTEGER, name TEXT)');
const stmt = db.prepare('INSERT INTO users VALUES (?, ?)');
stmt.run(1, 'Alice');
// 4. Glob pattern matching (node:fs)
import { glob } from 'node:fs/promises';
const files = await glob('**/*.ts', { exclude: ['node_modules/**'] });
// 5. V8 12.4: Array.fromAsync, Promise.withResolvers natively supported
const [resolve, reject, promise] = (() => {
let resolve, reject;
const promise = new Promise((res, rej) => { resolve = res; reject = rej; });
return [resolve, reject, promise];
})();
// Now cleaner with:
const { promise: p, resolve: r } = Promise.withResolvers();
Bun 1.x: Production Guide
// Bun is a drop-in replacement for Node.js — most things just work:
// package.json:
{
"scripts": {
"dev": "bun run --hot src/index.ts", // Hot reload
"build": "bun build src/index.ts --outdir dist",
"test": "bun test"
}
}
// Bun-specific APIs (faster than Node.js equivalents):
import { file, write } from 'bun';
// Read file (faster than fs.readFile):
const content = await Bun.file('./data.json').text();
const json = await Bun.file('./data.json').json();
// Write file:
await Bun.write('./output.txt', 'Hello, World!');
// Fast HTTP server:
const server = Bun.serve({
port: 3000,
fetch(req) {
return new Response('Hello!');
},
});
// Built-in SQLite:
import { Database } from 'bun:sqlite';
const db = new Database('data.db');
const stmt = db.prepare('SELECT * FROM users WHERE id = ?');
const user = stmt.get(1);
// Test runner:
import { test, expect } from 'bun:test';
test('adds numbers', () => {
expect(1 + 2).toBe(3);
});
// What DOESN'T work in Bun:
// → Native addons (.node files) — most packages use JS fallbacks anyway
// → worker_threads (limited) — Bun has its own Worker API
// → Some Node.js core module internals (rare edge cases)
// → vm module (partially implemented)
Deno 2.0: The npm Compatible Version
// Deno 2.0 added npm compatibility — the biggest Deno change since launch
// deno.json (replaces package.json):
{
"imports": {
"hono": "npm:hono@^4",
"zod": "npm:zod@^3",
"@/": "./src/"
},
"tasks": {
"dev": "deno run --watch src/main.ts",
"test": "deno test"
}
}
// Or use bare npm specifiers:
import { Hono } from 'npm:hono';
import { z } from 'npm:zod';
// Deno's security model — explicit permissions:
// deno run --allow-net --allow-read --allow-env src/main.ts
// No permissions = no access (reverse of Node.js)
// Run with all permissions (development convenience):
deno run -A src/main.ts
// Deno native APIs (TypeScript by default, no config):
const text = await Deno.readTextFile('./data.txt');
const data = JSON.parse(text);
await Deno.writeTextFile('./output.txt', JSON.stringify(data, null, 2));
// Deno Deploy — edge deployment:
// Same code, deployed to Deno's global edge network
// Free tier available, auto-scales
// Best for: API routes, simple backends, edge functions
// When Deno makes sense:
// → Security is a top priority (fintech, healthcare)
// → Team values integrated tooling (no eslint/prettier/jest setup)
// → Deploying to Deno Deploy
// → New greenfield TypeScript project where ecosystem lock-in is not a concern
Choosing Your Runtime
Node.js 22 LTS:
→ Existing Node.js codebase: stay, upgrade to 22
→ Native addons required (node-gyp packages): Node.js only
→ Maximum hosting compatibility (AWS Lambda, GCP, Azure, etc.)
→ Team without Bun/Deno experience: Node.js has the best docs/answers
→ Enterprise with strict LTS requirements
→ Next.js, Remix, or other frameworks with Node.js-specific optimizations
Bun 1.x:
→ New project where performance is a priority
→ APIs and backends that need to handle high throughput
→ Developer experience matters: fast installs, fast tests, zero-config TS
→ Team willing to hit occasional compatibility issues (rare, solvable)
→ Cloudflare Workers deployment (compatible with Bun APIs)
→ "I want the fastest possible development loop"
Deno 2.0:
→ Security-sensitive applications (permission model is genuinely useful)
→ Deploying to Deno Deploy
→ Projects that want all tooling built-in (no package.json scripts madness)
→ Node.js replacement where npm compatibility is needed (Deno 2.0 handles this)
→ Edge-first TypeScript APIs
The verdict (2026):
→ New project: Bun or Node.js 22 (Bun if DX matters, Node.js if risk-averse)
→ Performance-critical backend: Bun
→ Security-critical: Deno
→ Existing Node.js app: Stay, upgrade to Node.js 22
→ "I just want it to work": Node.js 22 — maximum ecosystem, no surprises
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