oven-sh/bun

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

Bun Documentation • Discord • Issues • Roadmap ### [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 # run the `start` script in `package.json` bun install # install a package bunx cowsay 'Hello, world!' # execute a package ``` ## Install Bun supports Linux (x64 & arm64), macOS (x64 & Apple Silicon), and Windows (x64 & arm64). > **Linux users** — Kernel version 5.6 or higher is strongly recommended, but the minimum is 5.1. > **x64 users** — if you see "illegal instruction" or similar errors, check our [CPU requirements](https://bun.com/docs/installation#cpu-requirements-and-baseline-builds) ```sh # with install script (recommended) curl -fsSL https://bun.com/install | bash # on windows powershell -c "irm bun.sh/install.ps1 | iex" # with npm npm install -g bun # with Homebrew brew tap oven-sh/bun brew install bun # with Docker docker pull oven/bun docker run --rm --init --ulimit memlock=-1:-1 oven/bun ``` ### Upgrade To upgrade to the latest version of Bun,