Quick Comparison
| Bun | Node.js | |
|---|---|---|
| Speed | Faster (Zig + JavaScriptCore) | Standard (V8) |
| Package manager | Built-in (fast) | npm/pnpm/yarn |
| TypeScript | Native (no build step) | Needs tsc/tsx |
| Test runner | Built-in | External (Jest, Vitest) |
| Compatibility | Most npm packages work | 100% ecosystem |
| Maturity | Young | Battle-tested |
When to Use Bun
- New projects where speed matters
- You want TypeScript without a build step
- You want an all-in-one tool (runtime + bundler + test runner + package manager)
- Scripts and tooling
When to Use Node.js
- Production apps that need maximum stability
- You need 100% npm compatibility
- Enterprise environments
- You depend on Node-specific APIs
Key Differences
Speed: Bun is genuinely faster — 3-5x for many operations. Package installs, test runs, and server startup are noticeably quicker.
Compatibility: Most npm packages work with Bun, but some native modules and Node-specific APIs don’t. This gap is shrinking but still exists.
All-in-One: Bun replaces Node + npm + tsc + Jest in a single binary. That’s compelling for developer experience.
Verdict
Bun for new projects and tooling. Node.js for production apps where stability is critical. In 2026, Bun is mature enough for most use cases, but Node.js isn’t going anywhere.