Bun vs Node.js in 2025: Should You Switch?

Bun launched with eye-popping benchmark numbers. Then developers started using it in production. A year later, the picture is more nuanced than the launch hype.

What's Genuinely Better

Package installation speed. bun install is absurdly fast. A node_modules install that takes 45 seconds with npm takes 4 seconds with Bun. This compounds across every developer on your team and every CI run. Switching to Bun just as a package manager — while keeping Node.js as the runtime — is an easy win with essentially zero risk.

TypeScript execution without compilation. bun run server.ts just works, no ts-node or esbuild setup required. For scripts and tools, this is a real quality-of-life improvement. No build step, no configuration, just run your TypeScript file.

The bundler. bun build is fast and produces good output. Not as mature as esbuild or Vite's ecosystem, but for simple bundling tasks it's excellent.

What's Still Rough

Native addons. If any of your dependencies use native compiled code (Sharp for image processing, bcrypt, certain database drivers), you'll likely hit issues. Some have been resolved as Bun matures, but it's still the most common source of compatibility problems.

The ecosystem for Bun-specific tooling is thin. When you hit a problem, Stack Overflow doesn't have the answer yet. You're often reading Bun's GitHub issues.

My Recommendation

New project with TypeScript, no native addons, deployment to Docker or Railway: try Bun. Existing Node.js project with complex dependencies: use bun install and bun test, keep Node.js as the runtime. Production server for a high-stakes application: stick with Node.js until Bun hits 2.0 and the ecosystem matures further.