Bun is a fast, all-in-one JavaScript runtime, bundler, transpiler, and package manager. Designed as a drop-in replacement for Node.js, it aims to improve speed and efficiency. Bun uses JavaScriptCore, a JavaScript engine developed by Apple, instead of V8. It supports TypeScript and JSX out of the box, and its built-in package manager boasts faster installation speeds compared to npm, yarn, and pnpm. Bun simplifies web development workflows with its comprehensive feature set.
Bun's npm package downloads demonstrate strong growth from March 2024 to August 2025, peaking at 1.46 million downloads. There's a clear upward trend, indicating increasing adoption. September 2025 shows a partial month with 303k downloads.
The bun package releases were initially sporadic between 2013 and 2017. After a long hiatus, releases became frequent starting in January 2023, with multiple versions deployed each month, peaking in mid-2023. The release rate remained consistent until August 2025, with a slight decreasing tendency in the last three months.
