Free
Open source
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Write a ReviewYes, Bun is open source and free. MIT licensed. No paid version. Drop-in Node.js replacement.
Bun is a fast JavaScript runtime, bundler, and package manager. Written in Zig for performance. Drop-in replacement for Node.js with native TypeScript support.
Bun is faster at starting and running JavaScript. Node.js is more mature with bigger ecosystem. Bun for speed; Node.js for compatibility.
JavaScript runtime (like Node), package manager (like npm), bundler (like webpack), and test runner. All-in-one toolkit.