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Bun is an all-in-one JavaScript runtime, bundler, transpiler, package manager, and test runner built from scratch in Zig for maximum performance. Starts and runs JavaScript/TypeScript up to 4x faster than Node.js with native support for JSX, TypeScript, and ESM without configuration. npm-compatible package manager installs dependencies 25x faster. Includes a built-in SQLite database, HTTP server, WebSocket support, and file I/O APIs. Drop-in Node.js replacement for most use cases.
Bun is a complete JS/TS runtime built in Zig combining runtime, bundler, transpiler, package manager, and test runner in a single binary replacing Node.js, npm, Webpack, Babel, and Jest.
4x faster JS execution via JavaScriptCore engine. Package installs 25x faster than npm. Native TypeScript, JSX, and ESM without configuration.
Built-in SQLite database, HTTP/WebSocket server, and file I/O APIs. Growing Node.js API compatibility with most npm packages working as drop-in replacement.
Free and open-source
macOS, Linux, Windows (WSL)
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