# Bun — All-in-One JavaScript Runtime & Toolkit

> Ultra-fast JavaScript runtime, bundler, test runner, and package manager in one tool. 4x faster than Node.js, drop-in compatible. Written in Zig with JavaScriptCore engine. 78,000+ stars.

## Install

Save as a script file and run:

## Quick Use

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

# Run JavaScript/TypeScript directly
bun run server.ts

# Install packages (fastest package manager)
bun install

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

# Run tests
bun test
```

---

## Intro

Bun is an all-in-one JavaScript runtime, bundler, test runner, and package manager with 78,000+ GitHub stars. Written in Zig with the JavaScriptCore engine (Safari), it runs JavaScript and TypeScript 4x faster than Node.js while being drop-in compatible with most Node.js code. One tool replaces node, npm, npx, webpack, jest, and tsx. Best for JavaScript/TypeScript developers who want maximum speed with minimal tooling complexity. Works with: any Node.js project (drop-in compatible). Setup time: under 1 minute.

---

## What Bun Replaces

| Old Tool | Bun Equivalent | Speed |
|----------|---------------|-------|
| Node.js | `bun run` | 4x faster startup |
| npm install | `bun install` | 25x faster |
| npx | `bunx` | 5x faster |
| webpack/esbuild | `bun build` | 2x faster than esbuild |
| jest/vitest | `bun test` | 8x faster than jest |
| tsx/ts-node | Native TypeScript | No transpilation step |

### Runtime Performance

```
# HTTP server benchmark (requests/second)
Bun:     145,000 req/s
Node.js:  36,000 req/s
Deno:     67,000 req/s
```

### Native TypeScript
Run `.ts` files directly — no `tsconfig.json`, no build step:

```bash
bun run server.ts  # Just works
```

### Package Manager Speed

```bash
# Installing a fresh Next.js project
npm install:  45 seconds
bun install:   1.8 seconds  (25x faster)
```

### Built-in Test Runner

```typescript
// math.test.ts
import { expect, test } from "bun:test";

test("addition", () => {
  expect(2 + 2).toBe(4);
});
```

```bash
bun test  # Runs all .test.ts files
```

### Built-in Bundler

```bash
bun build ./src/index.ts --outdir ./dist --minify
```

### Node.js Compatibility
Bun implements most Node.js APIs:
- `fs`, `path`, `http`, `crypto`, `stream`
- `process.env`, `__dirname`, `require()`
- npm packages work as-is

### Bun-Specific APIs

```typescript
// Fast file I/O
const file = Bun.file("data.json");
const data = await file.json();

// Built-in SQLite
import { Database } from "bun:sqlite";
const db = new Database("mydb.sqlite");

// Fast HTTP server
Bun.serve({
  port: 3000,
  fetch(req) {
    return new Response("Hello from Bun!");
  },
});
```

### Key Stats
- 78,000+ GitHub stars
- 4x faster than Node.js
- 25x faster package install
- Native TypeScript support
- Drop-in Node.js compatible

### FAQ

**Q: What is Bun?**
A: Bun is an all-in-one JavaScript runtime, package manager, bundler, and test runner that is 4x faster than Node.js and drop-in compatible with most Node.js code.

**Q: Is Bun free?**
A: Yes, fully open-source under MIT license.

**Q: Can I use Bun in production?**
A: Yes, Bun 1.0+ is production-ready. Companies like Figma and Sentry use it.

---

## Source & Thanks

> Created by [Oven](https://github.com/oven-sh). Licensed under MIT.
>
> [bun](https://github.com/oven-sh/bun) — ⭐ 78,000+

Thanks to Oven for making JavaScript fast again.

---

<!-- ZH -->

## 快速使用

```bash
curl -fsSL https://bun.sh/install | bash
bun run server.ts  # 直接运行 TypeScript
bun install        # 25 倍速包安装
bun test           # 内置测试运行器
```

---

## 简介

Bun 是一个全能 JavaScript 运行时、打包器、测试器和包管理器，GitHub 78,000+ stars。用 Zig 编写，比 Node.js 快 4 倍。一个工具替代 node、npm、webpack、jest。原生支持 TypeScript。适合追求极致速度的 JS/TS 开发者。

---

## 来源与感谢

> Created by [Oven](https://github.com/oven-sh). Licensed under MIT.
>
> [bun](https://github.com/oven-sh/bun) — ⭐ 78,000+

---
Source: https://tokrepo.com/en/workflows/944f2eb4-59c1-4ea8-91b9-2b682c0bd5a4
Author: Script Depot