bun-runtime
Bun Runtime
Overview
Bun is an all-in-one JavaScript and TypeScript runtime that includes a fast package manager, bundler, test runner, and Node.js-compatible APIs. It natively executes TypeScript and JSX without a separate compilation step.
When to use: Fast server-side JavaScript, TypeScript-first projects, replacing Node.js for better startup performance, built-in SQLite, password hashing, file I/O, HTTP servers, bundling, and testing without external tooling.
When NOT to use: Projects requiring full Node.js ecosystem compatibility (some native modules unsupported), production environments needing battle-tested stability of Node.js, or browser-only code that does not need a runtime.
Quick Reference
| Pattern | API | Key Points |
|---|---|---|
| HTTP server | Bun.serve({ routes, fetch }) |
Route-based, static/dynamic routes, per-method handlers |
| File read | Bun.file(path) |
Lazy BunFile (Blob), .text(), .json(), .stream() |
| File write | Bun.write(dest, data) |
Accepts string, Blob, Response, BunFile |
| SQLite | new Database(path) from bun:sqlite |
Synchronous queries, prepared statements, WAL mode |
| Password hash | Bun.password.hash(pw) |
Argon2id default, bcrypt option, async and sync variants |
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