Bun

Overview of Bun

Bun is a revolutionary all-in-one JavaScript toolkit designed to transform modern web development. Built from scratch as a fast, incrementally adoptable solution, Bun combines a high-performance JavaScript runtime, package manager, test runner, and bundler into a single cohesive platform.

It serves as a drop-in replacement for Node.js while delivering significantly better performance – starting 3x faster and handling up to 59,026 HTTP requests per second compared to Node.js's 19,039 in Express.js benchmarks. The platform aims for 100% Node.js compatibility while offering native TypeScript, JSX, and React support without configuration, making it ideal for Package Manager, CI/CD Tool, and Build Tool workflows.

How to Use Bun

Getting started with Bun is straightforward – you can adopt it incrementally or use the complete toolkit. Begin by installing Bun on your system, then use individual tools like bun install for package management or bun test for running tests in existing Node.js projects. For new projects, leverage the full stack by using bun create to scaffold applications, bun run to execute scripts, and bun build for bundling.

Core Features of Bun

1. JavaScript Runtime – Starts 3x faster than Node.js with built-in libraries
2. Package Manager – Installs packages 30x faster than npm with workspace support
3. Test Runner – Jest-compatible with built-in code coverage and snapshot testing
4. Bundler – Replaces Vite and esbuild with TypeScript and JSX support
5. WebSocket Server – High-performance implementation handling millions of messages

Use Cases for Bun

• Building high-performance web servers and APIs
• Developing React applications with zero-config TypeScript
• Creating command-line interfaces with fast startup
• Running comprehensive test suites with Jest compatibility
• Managing monorepos and workspaces efficiently
• Developing real-time applications using WebSocket servers
• Building and bundling for browser, server, and edge

Support and Contact

For technical support and inquiries, email contact@bun.sh or visit the official documentation at https://bun.sh/docs. The Bun community is active on Twitter at @bunjavascript for updates and discussions.

Company Info

Bun is developed by the Bun team based in the United States. The project is open source and freely available under an open source license.

Login and Signup

Bun is available as open source software with no registration required. You can download and start using Bun immediately from the official website at https://bun.sh.