What Is Bun?
Bun JavaScript Runtime
Bun is a fast, all-in-one JavaScript runtime that includes a package manager, bundler, test runner, and transpiler. Built with Zig and JavaScriptCore (Safari's engine), it's significantly faster than Node.js for many operations and aims to be a drop-in replacement.
How Bun Works
Bun installs packages 20-30x faster than npm, starts scripts instantly, and runs TypeScript natively without compilation. It's compatible with most Node.js APIs and npm packages. A single tool replaces Node.js + npm + webpack + jest.
Key Concepts
- Speed — Bun is built for performance — faster package installs, faster script startup, faster HTTP serving than Node.js
- All-in-One — Runtime, package manager, bundler, test runner, and TypeScript transpiler in a single binary
Frequently Asked Questions
Is Bun ready for production?
Bun 1.0+ is stable for many use cases. It's compatible with most npm packages and Node.js APIs. For critical production systems, test thoroughly — some edge cases may differ from Node.js behavior.