Bun vs Node

Bun and Node.js compete as JavaScript runtimes, with Bun offering dramatic speed improvements while Node.js provides unmatched ecosystem maturity.

Overview

Bun is an all-in-one JavaScript runtime (runtime + bundler + package manager + test runner) built in Zig for maximum performance. Node.js is the established JavaScript runtime with 15+ years of ecosystem, the largest package registry, and universal deployment support.

Key Differences

Speed: Bun is significantly faster — 3-5x faster startup, 2-3x faster package installs, and faster HTTP serving. Built-in SQLite and file operations are also faster. All-in-one: Bun includes bundler, test runner, and package manager. Node.js requires separate tools (webpack/vite, jest/vitest, npm/pnpm). Compatibility: Node.js has near-universal npm package compatibility. Bun is highly compatible but occasional edge cases with native modules exist. Ecosystem: Node.js has the larger, more battle-tested ecosystem. Bun's ecosystem is growing rapidly but smaller. Production usage: Node.js is proven at every scale imaginable. Bun is production-ready but with less production track record.

Verdict

Choose Node.js for maximum compatibility, production-proven stability, and the full npm ecosystem. Choose Bun for faster development workflow, all-in-one tooling, and when you can validate compatibility with your specific dependencies.