Bun (software)
| Bun | |
|---|---|
| Original author | Jarred Sumner |
| Developer | Anthropic |
| Initial release | September 14, 2021 |
| Stable release | 1.3.5
/ 17 December 2025 |
| Written in | Zig, C++ (JSC bindings), C (WebSocket bindings), TypeScript, JavaScript |
| Operating system | Linux, macOS, Windows |
| Type | Runtime environment |
| License | MIT license |
| Website | bun |
| Repository | github |
Bun is a JavaScript runtime, package manager and test runner designed as a drop-in replacement for Node.js. Bun uses Safari's JavaScriptCore as its JavaScript engine , unlike Node.js and Deno, which run on the V8 engine used by the Chromium project. It is currently owned by Anthropic PBC, having formerly been its own company, Oven.