Bun

At its core is the Bun runtime , a fast JavaScript runtime designed as a drop-in replacement for Node.js . It's written in Rust and powered by JavaScriptCore under the hood, dramatically reducing startup times and memory usage. The bun command-line tool also implements a test runner, script runner, and Node.js-compatible package manager. Instead of 1,000 node modules for development, you only need bun . Bun's built-in tools are significantly faster than existing options and usable in existing Node.js projects with little to no changes. Bun supports Linux (x64 & arm64), macOS (x64 & Apple Silicon), and Windows (x64 & arm64).