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Install Bun

Runtime Package Manager Bundler Test Runner Guides Reference Blog Feedback

Get Started

Welcome to Bun Installation Quickstart TypeScript TypeScript 6 and 7 bun init bun create

Core Runtime

Bun Runtime Watch Mode Debugging REPL bunfig.toml

File & Module System

File Types Module Resolution JSX Auto-install Plugins File System Router

HTTP server

Server Routing Cookies TLS Error Handling Metrics

Networking

Fetch WebSockets TCP UDP DNS

Data & Storage

Cookies File I/O Streams Binary Data Archive SQL SQLite S3 Redis

Concurrency

Process & System

Environment Variables Shell Spawn WebView Cron

Interop & Tooling

Node-API FFI C Compiler Transpiler

Utilities

CSRF Protection Secrets Console TOML YAML Markdown JSON5 JSONL HTMLRewriter Image Hashing Glob Semver Color Utils

Standards & Compatibility

Globals Bun APIs Web APIs Node.js Compatibility

Contributing

Roadmap Benchmarking Contributing Building Windows Bindgen License

Networking

WebSockets

Server-side WebSockets in Bun

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On this page

Start a WebSocket server Sending messages Headers Contextual data Pub/Sub Compression Backpressure Timeouts and limits Connect to a Websocket server Reference