Bun

lastmod 2026-02-24created 2022-07-077 edits

Fast JavaScript runtime/transpiler/NPM client based on JavaScriptCore

Features

• A JavaScript runtime like Node and Deno
• Developed with speed as the priority
  • Just replacing npm run with bun run makes it run 30x faster: https://twitter.com/jarredsumner/status/1454218996983623685
• Includes an npm-compatible package manager
  • Just replacing yarn with bun install installs packages 20x faster:
• Developed by extending JavaScriptCore, used in WebKit
  • Startup is far faster than existing engines such as V8: https://twitter.com/jarredsumner/status/1499225725492076544
• Designed so existing JavaScript/TypeScript apps can be used as-is: natively implements many node.js APIs including N-API, fs, path, and Buffer, and Web APIs including fetch, WebSocket, and ReadableStream
• Implements Node.js's module resolution algorithm, so node_modules can be used. Supports both ESM and CommonJS. Uses ESM internally.
• Every file is transpiled, so both TypeScript and JSX are supported.
• Automatically loads environment variables from .env files, so there is no longer any need to use require('dotenv').load().

Projects

• Elysia.js - Fast and friendly Bun web framework

See also

• node
• deno
• Electrobun - Cross-platform desktop applications written in TypeScript
• Bare - Fast, lightweight, modular JavaScript runtime
• bunqueue - High-performance SQLite-based job queue for Bun. Supports DLQ/cron/S3 backup

Favorit esite

• Bun is a fast all-in-one JavaScript runtime

Article

• Go vs Bun, is the Go language really faster than JS runtimes? | GeekNews (go, bun)
  • [Original] TSBOARD | Type Safety Community Builder