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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

C Compiler

Compile and run C from JavaScript with low overhead

FFI

Use Bun's FFI module to efficiently call native libraries from JavaScript

Transpiler

Use Bun's transpiler to transpile JavaScript and TypeScript code

On this page

Usage (cc in bun:ffi)Primitive types Strings, objects, and non-primitive types Returning a C string to JavaScript cc Reference library: string[]symbols source flags: string | string[]define: Record<string, string>