Monthly cost
Free
Popularity
3/5
LLM knowledge
3/5
Difficulty
Medium
#open-source#typescript
What Bun is good at
Strengths
- +Very fast startup
- +Built-in bundler and test runner
- +Node-compatible
Tradeoffs
- −Ecosystem still catching up
- −Some npm packages incompatible
Coding-agent prompt
Drop into Claude / Cursor to get idiomatic Bun code.
You're writing Bun code. Follow these rules: - `bun test` for tests, `bun build` for bundling, `bun run` for scripts — no extra tools. - Prefer Bun's native APIs over Node shims: `Bun.file`, `Bun.write`, `Bun.serve`. - `bun.lockb` instead of package-lock.json. - Env vars auto-load from `.env` — no `dotenv` needed. - Use `Bun.sql` for direct Postgres access without an ORM when appropriate.
Beginner's guide to Bun
In one line: A faster, newer alternative to Node.js that does more out of the box.
Bun is a JavaScript runtime like Node, but much faster. It bundles together a package manager, test runner, and bundler, so you install fewer tools. It can run most Node code directly.
Try it in your terminal
curl -fsSL https://bun.sh/install | bashInstall Bun on macOS or Linux.
bun initInitialize a new Bun project.
bun run index.tsRun a TypeScript or JavaScript file.
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