bun

Run JavaScript file

$ bun [script.js]

$ bun install

$ bun add [react]

$ bun run [dev]

$ bun create [react] [my-app]

$ bun test

bun command [options]

bun is an all-in-one JavaScript runtime, package manager, bundler, and test runner. It's designed as a drop-in replacement for Node.js with significantly faster startup times and package installation.
The tool aims to be a complete toolkit for JavaScript/TypeScript development with performance as a priority.

run file

Execute JavaScript/TypeScript file

Install dependencies from package.json

Add package to dependencies

Remove package

Run tests

Bundle for production

Create new project

Upgrade Bun itself

bunfig.toml

Project-level and global configuration for Bun. Controls package installation behavior, runtime settings, test runner options, and bundler defaults. Searched in the project root directory, or globally at ~/.bunfig.toml.

- Fast JavaScript runtime (using JavaScriptCore)
- Built-in TypeScript support
- Package manager (npm-compatible)
- Bundler (esbuild-compatible)
- Test runner
- Native web APIs
- Hot reloading
- SQLite support

- 4x faster npm install
- 2-3x faster script execution vs Node.js
- Near-instant startup

- Drop-in Node.js replacement (most APIs)
- npm package ecosystem
- Jest-compatible test runner
- ESM and CommonJS support

Not 100% Node.js compatible. Some native modules don't work. Relatively new (may have bugs). Breaking changes still possible. Not all npm packages tested. Windows support experimental.

Bun was created by Jarred Sumner and first released in 2021 as a fast all-in-one JavaScript toolkit built on Zig and JavaScriptCore.

node(1), npm(1), deno(1)