Node is still the safe default for production: 16 years of operational knowledge, every cloud platform supports it, every npm package targets it. Bun is faster (JavaScriptCore + Zig + native APIs) and bundles its own package manager, test runner, and TS compiler — but its ecosystem compatibility, while excellent, is not 100%. Use Bun for new projects and scripts; keep Node for things in production that work.
Bun
All-in-one JavaScript runtime + toolchain. Fast, drop-in for Node.
Both run JavaScript and TypeScript on the server. Node uses V8 (Chrome's engine) on top of libuv. Bun uses JavaScriptCore (Safari's engine) written in Zig with native implementations of common APIs. Bun is a runtime, package manager, test runner, and bundler in one binary. Node is a runtime with a thriving ecosystem of separate tools (npm/pnpm, tsx, esbuild, vitest). The Bun bet is that "fewer tools is better"; the Node bet is that "many tools, one each picked well" is better.
Quick takes
If you're…
You're running production today on Node 20+→NodeDon't change what works. Migrating to Bun is a project, not a flag flip.
You're writing a quick script or CLI tool→BunBun executes TypeScript directly, no build step. Faster startup.
You want the absolute best npm compatibility→NodeNode is the reference. Bun is close but not 100%.
You're bottlenecked on cold start (Lambda, edge functions)→BunBun starts measurably faster — important for serverless cold paths.
You need long-term support and predictable releases→NodeNode has scheduled LTS releases (active + maintenance). Bun is faster-moving but less predictable.
You're consolidating package manager + runtime + bundler→BunBun replaces all three. One install.
You're building on AWS Lambda or Vercel Edge→NodeNode has first-party support; Bun support is improving but still limited.
You're running benchmarks for fun and want bragging rights→BunBun wins most benchmark scenarios. Real-world matters more, but the speed is real.
JavaScriptCore (Safari's engine), written into Bun via Zig. Different optimisation profile than V8 — often faster on startup and string-heavy work.
Node
V8 (Chrome's engine), the most widely-tuned JS engine in the world. Predictable performance, mature profiling tools.
core
Cold start time
edge: Bun
Bun
Significantly faster cold start. ~30ms for a simple HTTP server vs ~120ms for Node. Matters for serverless.
Node
Slower cold start, but startup time has improved with snapshot-based init (Node 22+).
core
npm compatibility
edge: Node
Bun
Excellent — about 95%+ of npm packages work without modification. Native modules using N-API mostly work; some edge cases break.
Node
The reference. Every npm package targets Node first.
features
Built-in toolchain
edge: Bun
Bun
Package manager, test runner, bundler, .env loader, SQL driver (Bun.sql), HTTP server — all in the runtime binary.
Node
Just the runtime. Pair with npm/pnpm/yarn for packages, vitest/jest for tests, esbuild/Vite for bundling, dotenv for env, etc.
features
TypeScript support
edge: Bun
Bun
Native TypeScript execution. `bun run foo.ts` Just Works. No transpile step in dev.
Node
Type stripping support since Node 22.6 (experimental). Most teams still use tsx, ts-node, or compile-then-run.
core
Runtime performance
edge: Bun
Bun
Faster on most benchmarks (HTTP server, JSON parsing, package install). Particularly strong on workloads with lots of small files or short-lived processes.
Node
Slower on benchmarks, but consistent and well-understood. V8 optimisation has 16 years of operational experience behind it.
ops
Production maturity
edge: Node
Bun
Growing fast. Companies report production use but it's still measured in months, not years. Bug-fix turnaround is excellent.
Node
16 years in production. Every cloud platform, every PaaS, every observability tool supports it natively.
ecosystem
Release model
edge: Node
Bun
Frequent releases. No formal LTS yet. Versioning is semver but the velocity is closer to a Linux distro than a runtime.
Node
Scheduled LTS releases (active for 18 months, maintenance for 12). Predictable upgrade cycle.
Benchmark
HTTP server throughput, 64 concurrent connections
wrk benchmark, 30 seconds, 64 concurrent connections, simple JSON response. Both runtimes serving the same handler on Linux 6.8, c7i.2xlarge. Numbers from Bun's public benchmark suite + community retests on Node 22 LTS.
Metric
Bun
Node
Better
Requests/sec (hello world)
Bun's native HTTP server outpaces Node http.
148k rps
72k rps
Bun
p99 latency
1.8 ms
4.2 ms
Bun
Cold start (HTTP server)
Matters for AWS Lambda, Vercel Functions.
32 ms
118 ms
Bun
package install (Next.js project)
Bun install is the fastest npm install you can use.