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Overview
Bun is a fast, all-in-one JavaScript runtime and toolkit that bundles a runtime, package manager, test runner, and bundler into a single binary. Built on the JavaScriptCore engine, it delivers dramatically faster install times and runtime performance compared to Node.js, Deno, and other popular runtimes.
Developers love Bun for its speed and simplicity. With a single binary, you can install dependencies, run tests, bundle code, and serve applications without juggling multiple tools. Bun is npm-compatible, so existing Node.js projects can adopt bun install and bun test without any runtime switch required.
Bun has recently joined Anthropic, signaling strong industry backing and a commitment to continued development. The latest release, v1.4.3, continues to push performance boundaries with benchmarks showing up to 21x faster installs and 2x faster request handling than Node.js.
Key Features
- Fast Runtime: Built on JavaScriptCore, Bun delivers up to 2x faster I/
