Welcome to Bun
The all-in-one JavaScript runtime & toolkit designed for speed
Why Choose Bun?
Lightning Fast
Built from scratch in Zig, Bun is focused on performance and developer experience
All-in-One
Bundler, test runner, and npm-compatible package manager in a single tool
JavaScript Runtime
Drop-in replacement for Node.js with 3x faster startup time
Package Management
Native package manager that can install dependencies up to 30x faster than npm
Testing Made Simple
Built-in test runner with Jest-compatible API and snapshot testing
Hot Reloading
Lightning-fast hot module replacement (HMR) for rapid development