oven-sh/bun

Incredibly fast JavaScript runtime, bundler, test runner, and package manager – all in one

<p align="center"> <a href="https://bun.com"><img src="https://github.com/user-attachments/assets/50282090-adfd-4ddb-9e27-c30753c6b161" alt="Logo" height=170></a> </p> <h1 align="center">Bun</h1> <p align="center"> <a href="https://bun.com/discord" target="_blank"><img height=20 src="https://img.shields.io/discord/876711213126520882" /></a> <img src="https://img.shields.io/github/stars/oven-sh/bun" alt="stars"> <a href="https://twitter.com/jarredsumner/status/1542824445810642946"><img src="https://img.shields.io/static/v1?label=speed&message=fast&color=success" alt="Bun speed" /></a> </p> <div align="center"> <a href="https://bun.com/docs">Documentation</a> <span>&nbsp;&nbsp;•&nbsp;&nbsp;</span> <a href="https://bun.com/discord">Discord</a> <span>&nbsp;&nbsp;•&nbsp;&nbsp;</span> <a href="https://github.com/oven-sh/bun/issues/new">Issues</a> <span>&nbsp;&nbsp;•&nbsp;&nbsp;</span> <a href="https://github.com/oven-sh/bun/issues/159">Roadmap</a> <br /> </div> ### [Read the docs →](https://bun.com/docs) ## What is Bun? Bun is an all-in-one toolkit for JavaScript and TypeScript apps. It ships as a single executable called `bun`. At its core is the _Bun runtime_, a fast JavaScript runtime designed as **a drop-in replacement for Node.js**. It's written in Zig and powered by JavaScriptCore under the hood, dramatically reducing startup times and memory usage. ```bash bun run index.tsx # TS and JSX supported out-of-the-box ``` The `bun` command-line tool also implements a test runner, script runner, and Node.js-compatible package manager. Instead of 1,000 node_modules for development, you only need `bun`. Bun's built-in tools are significantly faster than existing options and usable in existing Node.js projects with little to no changes. ```bash bun test # run tests bun run start