Get Started

Welcome to Bun Installation Quickstart TypeScript TypeScript 6 and 7

Watch Mode Debugging REPL bunfig.toml File Types Module Resolution JSX Auto-install Plugins File System Router

Cookies File I/O Streams Binary Data Archive SQL SQLite S3 Redis Workers Environment Variables Shell Spawn WebView Cron Node-API FFI C Compiler Transpiler CSRF Protection Secrets Console TOML YAML Markdown JSON5 JSONL HTMLRewriter Image Hashing Glob Semver Color Utils Globals Bun APIs Web APIs Node.js Compatibility

Standards & Compatibility

Environment Variables

Read and configure environment variables in Bun, including automatic .env file support

Workers

Use Bun's Workers API to create and communicate with a new JavaScript instance running on a separate thread while sharing I/O resources with the main thread

Shell

Use Bun's shell scripting API to run shell commands from JavaScript

On this page

Setting environment variables Manually specifying .env files Disabling automatic .env loading Quotation marks Expansion dotenv Reading environment variables TypeScript Configuring Bun Runtime transpiler caching Disable the runtime transpiler cache What does it cache?