Bun Has a Free JavaScript Runtime — 3x Faster Than Node.js

Bun is an all-in-one JavaScript runtime — runtime, package manager, bundler, and test runner, 3x faster than Node.js.

What You Get for Free

• 3x faster runtime — JavaScriptCore (Safari's engine) vs V8
• Bun install — npm-compatible, 25x faster installs
• Bun test — Jest-compatible test runner, built-in
• Bun build — esbuild-speed bundler, built-in
• Node.js compatible — drop-in replacement for most Node apps
• TypeScript native — run .ts files directly, no compilation
• SQLite built-in — bun:sqlite module, zero install
• Hot reload — bun --hot for development
• Macros — compile-time code execution

Quick Start

curl -fsSL https://bun.sh/install | bash

# Run TypeScript directly
bun run server.ts

# Install packages (25x faster than npm)
bun install

# Run tests
bun test

# Bundle
bun build ./src/index.ts --outdir ./dist

Why Developers Switch from Node.js

Node.js is 15 years old and needs separate tools for everything:

• All-in-one — no more npm + tsc + jest + webpack
• 3x faster — HTTP server benchmarks: 3x requests/second
• TypeScript native — no tsconfig, no ts-node, just works
• SQLite built-in — no npm install sqlite3, native module

A Node.js API handled 50K requests/second. Same code on Bun: 150K requests/second. Package installs went from 45 seconds to 2 seconds.

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