Node.js vs Bun vs Deno in 2026: Runtime Comparison with Real Benchmarks
The JavaScript runtime wars settled into something useful in 2026. Bun is production-stable and genuinely fast. Deno 2.0 dropped its "no npm" ideology and embraced compatibility. Node.js 22 runs TypeScript natively (with --experimental-strip-types). The choice is no longer "use Node.js" by default.
What Changed in 2025-2026
Bun 1.0+ (released Sep 2023, stable production use 2025):
- Complete npm compatibility
- Built-in bundler, test runner, package manager
- JavaScriptCore engine (Safari's engine, not V8)
- Node.js API compatibility layer (>95% of APIs work)
Deno 2.0 (released Oct 2024):
- Full npm support (
npm:specifier) - Node.js compatibility mode
- Workspaces support
- Permission model simplified
Node.js 22/23:
--experimental-strip-types: run.tsfiles directly- Native test runner mature
- V8 12.x with better performance
- Maglev compiler default
HTTP Server Benchmarks
Testing a minimal HTTP server returning { "hello": "world" } on identical hardware (8-core, 16GB RAM).
| Runtime | Requests/sec | Latency p99 | Memory |
|---|---|---|---|
| Bun 1.1 | ~240,000 | 1.2ms | 48 MB |
| Node.js 22 (uWS) | ~210,000 | 1.4ms | 62 MB |
| Node.js 22 (http) | ~85,000 | 2.8ms | 78 MB |
| Deno 2.0 | ~78,000 | 3.1ms | 54 MB |
| Node.js 20 (http) | ~68,000 | 3.4ms | 82 MB |
Bun's HTTP server is the fastest in plain benchmarks. But for real Express.js-style apps:
| Framework | Runtime | Req/sec |
|---|---|---|
| Bun native | Bun | ~240k |
| Elysia.js | Bun | ~220k |
| Fastify | Node.js | ~115k |
| Hono | Node.js / Bun | ~130k (Node) / ~210k (Bun) |
| Express.js | Node.js | ~58k |
Hono on Bun is the sweet spot for new projects that want both performance and ecosystem.
Package Manager Speed
| Operation | npm | pnpm | Yarn | bun install |
|---|---|---|---|---|
| Cold install (no cache) | 28s | 12s | 14s | 2.1s |
| Warm install (cache) | 18s | 3.2s | 4.1s | 0.4s |
| node_modules size | 340MB | 320MB (hard links) | 330MB | 298MB |
bun install is ~14x faster than npm on cache hits. In CI, this is material.
TypeScript Support Comparison
Node.js 22 - Experimental Strip Types
# Run TypeScript directly (strips types, no transform)
node --experimental-strip-types server.ts
Limitation: no enum, no experimental decorators, no const enum. It literally strips type annotations. Good for simple cases.
Bun - First-Class TypeScript
# Just works, no flags needed
bun run server.ts
bun run server.tsx
Bun transpiles TypeScript in-process using its own bundler. No separate tsc step. Enums, decorators, all features work. This is the most developer-friendly TypeScript experience.
Deno - Built-In TypeScript
# Works out of the box
deno run server.ts
Deno was the first to support TypeScript natively. Full support, strict mode by default.
Ecosystem Compatibility
| Feature | Node.js | Bun | Deno |
|---|---|---|---|
| npm packages | Native | 95%+ | npm: specifier |
| CommonJS (require) | Native | Yes | Partial |
| ESM | Yes | Yes | Native (required) |
| package.json | Yes | Yes | Optional |
__dirname, __filename |
Yes | Yes | No (use import.meta) |
| Worker Threads | Yes | Yes | Yes (Web Workers) |
| Native modules (.node) | Yes | Limited | No |
The critical difference: if you use native Node.js addons (sharp, better-sqlite3, some crypto), Bun may not work. Most pure-JS packages work fine.
Security Model
Node.js - No Sandboxing (Default)
Node.js runs with full system access. Any package you install can read files, make network requests, spawn processes.
Deno - Permission-Based
# Must explicitly grant permissions
deno run --allow-net=api.example.com --allow-read=/tmp server.ts
# No permission = runtime error when attempted
This is Deno's most compelling safety feature for untrusted code.
Bun - No Sandboxing (Default)
Same as Node.js. Bun is working on a permission system but it's not the default.
Real-World Framework Compatibility
| Framework | Node.js | Bun | Deno |
|---|---|---|---|
| Express.js | ✅ | ✅ | ✅ (npm:) |
| Fastify | ✅ | ✅ | ✅ |
| NestJS | ✅ | ✅ (experimental) | ✅ |
| Next.js | ✅ | ✅ | No |
| Remix | ✅ | ✅ | Partial |
| Prisma | ✅ | ✅ | ✅ |
| Drizzle | ✅ | ✅ | ✅ |
Next.js on Bun works. bun run next dev is noticeably faster to start than npm run next dev.
Built-In Tools Comparison
| Tool | Node.js | Bun | Deno |
|---|---|---|---|
| Test runner | node --test |
bun test |
deno test |
| Bundler | No (use webpack/esbuild) | bun build |
deno bundle |
| TypeScript | --experimental-strip-types |
Native | Native |
| Formatter | No | No | deno fmt |
| Linter | No | No | deno lint |
| Package manager | npm | bun install |
deno add |
| Watch mode | --watch |
--watch |
--watch |
Deno's all-in-one toolchain is exceptional for new projects. deno fmt + deno lint out of the box with zero config is genuinely nice.
When to Use Each Runtime
Use Node.js when:
- Existing production codebase
- Team is deeply familiar with Node ecosystem
- Using native addons (sharp, node-gyp dependencies)
- Enterprise environment where stability/LTS matters most
- Running NestJS at scale with well-known ops patterns
Use Bun when:
- New project with performance requirements
- TypeScript-first development
- Want faster
npm installin CI - Simple HTTP API where raw throughput matters
- Already using Hono or Elysia
Use Deno when:
- Security is a primary concern (untrusted code, scripting)
- Edge/serverless (Deno Deploy, Netlify Edge)
- Single-file scripts with zero config
- Fresh framework (Deno's own web framework)
- You want the formatter/linter built in
Migration Path from Node.js to Bun
Most Node.js apps can run on Bun with minimal changes:
# Replace package manager
bun install # instead of npm install
# Run scripts
bun run dev # instead of npm run dev
# Things that might break:
# 1. Native addons - check bun compatibility
# 2. package.json "exports" edge cases
# 3. Some edge cases in Node.js stream API
A practical approach: run your test suite on Bun. If it passes, your app will likely work.
The Verdict
For new production projects in 2026: Bun for APIs and backend services where you control the stack, Node.js where you need maximum ecosystem compatibility or have native module dependencies.
For existing projects: stay on Node.js unless you have specific pain points (slow CI installs, raw throughput requirements).
For edge/serverless: Deno Deploy or Cloudflare Workers (using Workerd runtime) - both handle the cold start problem better than Node.js Lambda.
The days of "JavaScript runtime = Node.js" are over, but Node.js isn't going anywhere.
Aunimeda builds high-performance backends in Node.js and Bun. Talk to us.
See also: OWASP Top 10 Security Guide, WebSocket 100k connections architecture
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