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https://github.com/oven-sh/bun

Incredibly fast JavaScript runtime, bundler, test runner, and package manager – all in one
https://github.com/oven-sh/bun

bun bundler javascript javascriptcore jsx nodejs npm react transpiler typescript zig ziglang

Last synced: 1 day ago
JSON representation

Incredibly fast JavaScript runtime, bundler, test runner, and package manager – all in one

Host: GitHub
URL: https://github.com/oven-sh/bun
Owner: oven-sh
License: other
Created: 2021-04-14T00:48:17.000Z (almost 4 years ago)
Default Branch: main
Last Pushed: 2025-01-08T02:22:22.000Z (7 days ago)
Last Synced: 2025-01-08T02:23:59.565Z (7 days ago)
Topics: bun, bundler, javascript, javascriptcore, jsx, nodejs, npm, react, transpiler, typescript, zig, ziglang
Language: Zig
Homepage: https://bun.sh
Size: 220 MB
Stars: 75,177
Watchers: 589
Forks: 2,824
Open Issues: 4,229
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- License: LICENSE.md
- Code of conduct: CODE_OF_CONDUCT.md
- Security: SECURITY.md

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README

        


  



Bun














  Documentation

    •  

  Discord

    •  

  Issues

    •  

  Roadmap

  




### [Read the docs →](https://bun.sh/docs)

## What is Bun?

Bun is an all-in-one toolkit for JavaScript and TypeScript apps. It ships as a single executable called `bun`.

At its core is the _Bun runtime_, a fast JavaScript runtime designed as a drop-in replacement for Node.js. It's written in Zig and powered by JavaScriptCore under the hood, dramatically reducing startup times and memory usage.

```bash

bun run index.tsx             # TS and JSX supported out-of-the-box

```

The `bun` command-line tool also implements a test runner, script runner, and Node.js-compatible package manager. Instead of 1,000 node_modules for development, you only need `bun`. Bun's built-in tools are significantly faster than existing options and usable in existing Node.js projects with little to no changes.

```bash

bun test                      # run tests

bun run start                 # run the `start` script in `package.json`

bun install              # install a package

bunx cowsay 'Hello, world!'   # execute a package

```

## Install

Bun supports Linux (x64 & arm64), macOS (x64 & Apple Silicon) and Windows (x64).

> **Linux users** — Kernel version 5.6 or higher is strongly recommended, but the minimum is 5.1.

```sh

# with install script (recommended)

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

# on windows

powershell -c "irm bun.sh/install.ps1 | iex"

# with npm

npm install -g bun

# with Homebrew

brew tap oven-sh/bun

brew install bun

# with Docker

docker pull oven/bun

docker run --rm --init --ulimit memlock=-1:-1 oven/bun

```

### Upgrade

To upgrade to the latest version of Bun, run:

```sh

bun upgrade

```

Bun automatically releases a canary build on every commit to `main`. To upgrade to the latest canary build, run:

```sh

bun upgrade --canary

```

[View canary build](https://github.com/oven-sh/bun/releases/tag/canary)

## Quick links

- Intro

  - [What is Bun?](https://bun.sh/docs/index)

  - [Installation](https://bun.sh/docs/installation)

  - [Quickstart](https://bun.sh/docs/quickstart)

  - [TypeScript](https://bun.sh/docs/typescript)

- Templating

  - [`bun init`](https://bun.sh/docs/cli/init)

  - [`bun create`](https://bun.sh/docs/cli/bun-create)

- Runtime

  - [`bun run`](https://bun.sh/docs/cli/run)

  - [File types](https://bun.sh/docs/runtime/loaders)

  - [TypeScript](https://bun.sh/docs/runtime/typescript)

  - [JSX](https://bun.sh/docs/runtime/jsx)

  - [Environment variables](https://bun.sh/docs/runtime/env)

  - [Bun APIs](https://bun.sh/docs/runtime/bun-apis)

  - [Web APIs](https://bun.sh/docs/runtime/web-apis)

  - [Node.js compatibility](https://bun.sh/docs/runtime/nodejs-apis)

  - [Single-file executable](https://bun.sh/docs/bundler/executables)

  - [Plugins](https://bun.sh/docs/runtime/plugins)

  - [Watch mode](https://bun.sh/docs/runtime/hot)

  - [Module resolution](https://bun.sh/docs/runtime/modules)

  - [Auto-install](https://bun.sh/docs/runtime/autoimport)

  - [bunfig.toml](https://bun.sh/docs/runtime/bunfig)

  - [Debugger](https://bun.sh/docs/runtime/debugger)

  - [Framework API](https://bun.sh/docs/runtime/framework)

- Package manager

  - [`bun install`](https://bun.sh/docs/cli/install)

  - [`bun add`](https://bun.sh/docs/cli/add)

  - [`bun remove`](https://bun.sh/docs/cli/remove)

  - [`bun update`](https://bun.sh/docs/cli/update)

  - [`bun link`](https://bun.sh/docs/cli/link)

  - [`bun pm`](https://bun.sh/docs/cli/pm)

  - [Global cache](https://bun.sh/docs/install/cache)

  - [Workspaces](https://bun.sh/docs/install/workspaces)

  - [Lifecycle scripts](https://bun.sh/docs/install/lifecycle)

  - [Filter](https://bun.sh/docs/cli/filter)

  - [Lockfile](https://bun.sh/docs/install/lockfile)

  - [Scopes and registries](https://bun.sh/docs/install/registries)

  - [Overrides and resolutions](https://bun.sh/docs/install/overrides)

- Bundler

  - [`Bun.build`](https://bun.sh/docs/bundler)

  - [Loaders](https://bun.sh/docs/bundler/loaders)

  - [Plugins](https://bun.sh/docs/bundler/plugins)

  - [Macros](https://bun.sh/docs/bundler/macros)

  - [vs esbuild](https://bun.sh/docs/bundler/vs-esbuild)

- Test runner

  - [`bun test`](https://bun.sh/docs/cli/test)

  - [Writing tests](https://bun.sh/docs/test/writing)

  - [Watch mode](https://bun.sh/docs/test/hot)

  - [Lifecycle hooks](https://bun.sh/docs/test/lifecycle)

  - [Mocks](https://bun.sh/docs/test/mocks)

  - [Snapshots](https://bun.sh/docs/test/snapshots)

  - [Dates and times](https://bun.sh/docs/test/time)

  - [DOM testing](https://bun.sh/docs/test/dom)

  - [Code coverage](https://bun.sh/docs/test/coverage)

- Package runner

  - [`bunx`](https://bun.sh/docs/cli/bunx)

- API

  - [HTTP server](https://bun.sh/docs/api/http)

  - [WebSockets](https://bun.sh/docs/api/websockets)

  - [Workers](https://bun.sh/docs/api/workers)

  - [Binary data](https://bun.sh/docs/api/binary-data)

  - [Streams](https://bun.sh/docs/api/streams)

  - [File I/O](https://bun.sh/docs/api/file-io)

  - [import.meta](https://bun.sh/docs/api/import-meta)

  - [SQLite](https://bun.sh/docs/api/sqlite)

  - [FileSystemRouter](https://bun.sh/docs/api/file-system-router)

  - [TCP sockets](https://bun.sh/docs/api/tcp)

  - [UDP sockets](https://bun.sh/docs/api/udp)

  - [Globals](https://bun.sh/docs/api/globals)

  - [$ Shell](https://bun.sh/docs/runtime/shell)

  - [Child processes](https://bun.sh/docs/api/spawn)

  - [Transpiler](https://bun.sh/docs/api/transpiler)

  - [Hashing](https://bun.sh/docs/api/hashing)

  - [Console](https://bun.sh/docs/api/console)

  - [FFI](https://bun.sh/docs/api/ffi)

  - [HTMLRewriter](https://bun.sh/docs/api/html-rewriter)

  - [Testing](https://bun.sh/docs/api/test)

  - [Utils](https://bun.sh/docs/api/utils)

  - [Node-API](https://bun.sh/docs/api/node-api)

  - [Glob](https://bun.sh/docs/api/glob)

  - [Semver](https://bun.sh/docs/api/semver)

- Project

  - [Roadmap](https://bun.sh/docs/project/roadmap)

  - [Benchmarking](https://bun.sh/docs/project/benchmarking)

  - [Contributing](https://bun.sh/docs/project/contributing)

  - [Building Windows](https://bun.sh/docs/project/building-windows)

  - [License](https://bun.sh/docs/project/licensing)

## Guides

- Binary

  - [Convert a Blob to a DataView](https://bun.sh/guides/binary/blob-to-dataview)

  - [Convert a Blob to a ReadableStream](https://bun.sh/guides/binary/blob-to-stream)

  - [Convert a Blob to a string](https://bun.sh/guides/binary/blob-to-string)

  - [Convert a Blob to a Uint8Array](https://bun.sh/guides/binary/blob-to-typedarray)

  - [Convert a Blob to an ArrayBuffer](https://bun.sh/guides/binary/blob-to-arraybuffer)

  - [Convert a Buffer to a blob](https://bun.sh/guides/binary/buffer-to-blob)

  - [Convert a Buffer to a ReadableStream](https://bun.sh/guides/binary/buffer-to-readablestream)

  - [Convert a Buffer to a string](https://bun.sh/guides/binary/buffer-to-string)

  - [Convert a Buffer to a Uint8Array](https://bun.sh/guides/binary/buffer-to-typedarray)

  - [Convert a Buffer to an ArrayBuffer](https://bun.sh/guides/binary/buffer-to-arraybuffer)

  - [Convert a DataView to a string](https://bun.sh/guides/binary/dataview-to-string)

  - [Convert a Uint8Array to a Blob](https://bun.sh/guides/binary/typedarray-to-blob)

  - [Convert a Uint8Array to a Buffer](https://bun.sh/guides/binary/typedarray-to-buffer)

  - [Convert a Uint8Array to a DataView](https://bun.sh/guides/binary/typedarray-to-dataview)

  - [Convert a Uint8Array to a ReadableStream](https://bun.sh/guides/binary/typedarray-to-readablestream)

  - [Convert a Uint8Array to a string](https://bun.sh/guides/binary/typedarray-to-string)

  - [Convert a Uint8Array to an ArrayBuffer](https://bun.sh/guides/binary/typedarray-to-arraybuffer)

  - [Convert an ArrayBuffer to a Blob](https://bun.sh/guides/binary/arraybuffer-to-blob)

  - [Convert an ArrayBuffer to a Buffer](https://bun.sh/guides/binary/arraybuffer-to-buffer)

  - [Convert an ArrayBuffer to a string](https://bun.sh/guides/binary/arraybuffer-to-string)

  - [Convert an ArrayBuffer to a Uint8Array](https://bun.sh/guides/binary/arraybuffer-to-typedarray)

  - [Convert an ArrayBuffer to an array of numbers](https://bun.sh/guides/binary/arraybuffer-to-array)

- Ecosystem

  - [Build a frontend using Vite and Bun](https://bun.sh/guides/ecosystem/vite)

  - [Build an app with Astro and Bun](https://bun.sh/guides/ecosystem/astro)

  - [Build an app with Next.js and Bun](https://bun.sh/guides/ecosystem/nextjs)

  - [Build an app with Nuxt and Bun](https://bun.sh/guides/ecosystem/nuxt)

  - [Build an app with Qwik and Bun](https://bun.sh/guides/ecosystem/qwik)

  - [Build an app with Remix and Bun](https://bun.sh/guides/ecosystem/remix)

  - [Build an app with SolidStart and Bun](https://bun.sh/guides/ecosystem/solidstart)

  - [Build an app with SvelteKit and Bun](https://bun.sh/guides/ecosystem/sveltekit)

  - [Build an HTTP server using Elysia and Bun](https://bun.sh/guides/ecosystem/elysia)

  - [Build an HTTP server using Express and Bun](https://bun.sh/guides/ecosystem/express)

  - [Build an HTTP server using Hono and Bun](https://bun.sh/guides/ecosystem/hono)

  - [Build an HTTP server using StricJS and Bun](https://bun.sh/guides/ecosystem/stric)

  - [Containerize a Bun application with Docker](https://bun.sh/guides/ecosystem/docker)

  - [Create a Discord bot](https://bun.sh/guides/ecosystem/discordjs)

  - [Deploy a Bun application on Render](https://bun.sh/guides/ecosystem/render)

  - [Read and write data to MongoDB using Mongoose and Bun](https://bun.sh/guides/ecosystem/mongoose)

  - [Run Bun as a daemon with PM2](https://bun.sh/guides/ecosystem/pm2)

  - [Run Bun as a daemon with systemd](https://bun.sh/guides/ecosystem/systemd)

  - [Server-side render (SSR) a React component](https://bun.sh/guides/ecosystem/ssr-react)

  - [Use Drizzle ORM with Bun](https://bun.sh/guides/ecosystem/drizzle)

  - [Use EdgeDB with Bun](https://bun.sh/guides/ecosystem/edgedb)

  - [Use Neon's Serverless Postgres with Bun](https://bun.sh/guides/ecosystem/neon-serverless-postgres)

  - [Use Prisma with Bun](https://bun.sh/guides/ecosystem/prisma)

  - [Use React and JSX](https://bun.sh/guides/ecosystem/react)

  - [Add Sentry to a Bun app](https://bun.sh/guides/ecosystem/sentry)

- HTTP

  - [Common HTTP server usage](https://bun.sh/guides/http/server)

  - [Configure TLS on an HTTP server](https://bun.sh/guides/http/tls)

  - [fetch with unix domain sockets in Bun](https://bun.sh/guides/http/fetch-unix)

  - [Hot reload an HTTP server](https://bun.sh/guides/http/hot)

  - [Proxy HTTP requests using fetch()](https://bun.sh/guides/http/proxy)

  - [Send an HTTP request using fetch](https://bun.sh/guides/http/fetch)

  - [Start a cluster of HTTP servers](https://bun.sh/guides/http/cluster)

  - [Stream a file as an HTTP Response](https://bun.sh/guides/http/stream-file)

  - [Streaming HTTP Server with Async Iterators](https://bun.sh/guides/http/stream-iterator)

  - [Streaming HTTP Server with Node.js Streams](https://bun.sh/guides/http/stream-node-streams-in-bun)

  - [Upload files via HTTP using FormData](https://bun.sh/guides/http/file-uploads)

  - [Write a simple HTTP server](https://bun.sh/guides/http/simple)

- Install

  - [Add a dependency](https://bun.sh/guides/install/add)

  - [Add a development dependency](https://bun.sh/guides/install/add-dev)

  - [Add a Git dependency](https://bun.sh/guides/install/add-git)

  - [Add a peer dependency](https://bun.sh/guides/install/add-peer)

  - [Add a tarball dependency](https://bun.sh/guides/install/add-tarball)

  - [Add a trusted dependency](https://bun.sh/guides/install/trusted)

  - [Add an optional dependency](https://bun.sh/guides/install/add-optional)

  - [Configure a private registry for an organization scope with bun install](https://bun.sh/guides/install/registry-scope)

  - [Configure git to diff Bun's lockb lockfile](https://bun.sh/guides/install/git-diff-bun-lockfile)

  - [Configuring a monorepo using workspaces](https://bun.sh/guides/install/workspaces)

  - [Generate a human-readable lockfile](https://bun.sh/guides/install/yarnlock)

  - [Install a package under a different name](https://bun.sh/guides/install/npm-alias)

  - [Install dependencies with Bun in GitHub Actions](https://bun.sh/guides/install/cicd)

  - [Override the default npm registry for bun install](https://bun.sh/guides/install/custom-registry)

  - [Using bun install with an Azure Artifacts npm registry](https://bun.sh/guides/install/azure-artifacts)

  - [Using bun install with Artifactory](https://bun.sh/guides/install/jfrog-artifactory)

- Process

  - [Get the process uptime in nanoseconds](https://bun.sh/guides/process/nanoseconds)

  - [Listen for CTRL+C](https://bun.sh/guides/process/ctrl-c)

  - [Listen to OS signals](https://bun.sh/guides/process/os-signals)

  - [Parse command-line arguments](https://bun.sh/guides/process/argv)

  - [Read from stdin](https://bun.sh/guides/process/stdin)

  - [Read stderr from a child process](https://bun.sh/guides/process/spawn-stderr)

  - [Read stdout from a child process](https://bun.sh/guides/process/spawn-stdout)

  - [Spawn a child process](https://bun.sh/guides/process/spawn)

  - [Spawn a child process and communicate using IPC](https://bun.sh/guides/process/ipc)

- Read file

  - [Check if a file exists](https://bun.sh/guides/read-file/exists)

  - [Get the MIME type of a file](https://bun.sh/guides/read-file/mime)

  - [Read a file as a ReadableStream](https://bun.sh/guides/read-file/stream)

  - [Read a file as a string](https://bun.sh/guides/read-file/string)

  - [Read a file to a Buffer](https://bun.sh/guides/read-file/buffer)

  - [Read a file to a Uint8Array](https://bun.sh/guides/read-file/uint8array)

  - [Read a file to an ArrayBuffer](https://bun.sh/guides/read-file/arraybuffer)

  - [Read a JSON file](https://bun.sh/guides/read-file/json)

  - [Watch a directory for changes](https://bun.sh/guides/read-file/watch)

- Runtime

  - [Debugging Bun with the VS Code extension](https://bun.sh/guides/runtime/vscode-debugger)

  - [Debugging Bun with the web debugger](https://bun.sh/guides/runtime/web-debugger)

  - [Define and replace static globals & constants](https://bun.sh/guides/runtime/define-constant)

  - [Import a JSON file](https://bun.sh/guides/runtime/import-json)

  - [Import a TOML file](https://bun.sh/guides/runtime/import-toml)

  - [Import HTML file as text](https://bun.sh/guides/runtime/import-html)

  - [Install and run Bun in GitHub Actions](https://bun.sh/guides/runtime/cicd)

  - [Install TypeScript declarations for Bun](https://bun.sh/guides/runtime/typescript)

  - [Re-map import paths](https://bun.sh/guides/runtime/tsconfig-paths)

  - [Read environment variables](https://bun.sh/guides/runtime/read-env)

  - [Run a Shell Command](https://bun.sh/guides/runtime/shell)

  - [Set a time zone in Bun](https://bun.sh/guides/runtime/timezone)

  - [Set environment variables](https://bun.sh/guides/runtime/set-env)

- Streams

  - [Convert a Node.js Readable to a Blob](https://bun.sh/guides/streams/node-readable-to-blob)

  - [Convert a Node.js Readable to a string](https://bun.sh/guides/streams/node-readable-to-string)

  - [Convert a Node.js Readable to an ArrayBuffer](https://bun.sh/guides/streams/node-readable-to-arraybuffer)

  - [Convert a Node.js Readable to JSON](https://bun.sh/guides/streams/node-readable-to-json)

  - [Convert a ReadableStream to a Blob](https://bun.sh/guides/streams/to-blob)

  - [Convert a ReadableStream to a Buffer](https://bun.sh/guides/streams/to-buffer)

  - [Convert a ReadableStream to a string](https://bun.sh/guides/streams/to-string)

  - [Convert a ReadableStream to a Uint8Array](https://bun.sh/guides/streams/to-typedarray)

  - [Convert a ReadableStream to an array of chunks](https://bun.sh/guides/streams/to-array)

  - [Convert a ReadableStream to an ArrayBuffer](https://bun.sh/guides/streams/to-arraybuffer)

  - [Convert a ReadableStream to JSON](https://bun.sh/guides/streams/to-json)

- Test

  - [Bail early with the Bun test runner](https://bun.sh/guides/test/bail)

  - [Generate code coverage reports with the Bun test runner](https://bun.sh/guides/test/coverage)

  - [Mark a test as a "todo" with the Bun test runner](https://bun.sh/guides/test/todo-tests)

  - [Migrate from Jest to Bun's test runner](https://bun.sh/guides/test/migrate-from-jest)

  - [Mock functions in `bun test`](https://bun.sh/guides/test/mock-functions)

  - [Re-run tests multiple times with the Bun test runner](https://bun.sh/guides/test/rerun-each)

  - [Run tests in watch mode with Bun](https://bun.sh/guides/test/watch-mode)

  - [Run your tests with the Bun test runner](https://bun.sh/guides/test/run-tests)

  - [Set a code coverage threshold with the Bun test runner](https://bun.sh/guides/test/coverage-threshold)

  - [Set a per-test timeout with the Bun test runner](https://bun.sh/guides/test/timeout)

  - [Set the system time in Bun's test runner](https://bun.sh/guides/test/mock-clock)

  - [Skip tests with the Bun test runner](https://bun.sh/guides/test/skip-tests)

  - [Spy on methods in `bun test`](https://bun.sh/guides/test/spy-on)

  - [Update snapshots in `bun test`](https://bun.sh/guides/test/update-snapshots)

  - [Use snapshot testing in `bun test`](https://bun.sh/guides/test/snapshot)

  - [Write browser DOM tests with Bun and happy-dom](https://bun.sh/guides/test/happy-dom)

- Util

  - [Check if the current file is the entrypoint](https://bun.sh/guides/util/entrypoint)

  - [Check if two objects are deeply equal](https://bun.sh/guides/util/deep-equals)

  - [Compress and decompress data with DEFLATE](https://bun.sh/guides/util/deflate)

  - [Compress and decompress data with gzip](https://bun.sh/guides/util/gzip)

  - [Convert a file URL to an absolute path](https://bun.sh/guides/util/file-url-to-path)

  - [Convert an absolute path to a file URL](https://bun.sh/guides/util/path-to-file-url)

  - [Detect when code is executed with Bun](https://bun.sh/guides/util/detect-bun)

  - [Encode and decode base64 strings](https://bun.sh/guides/util/base64)

  - [Escape an HTML string](https://bun.sh/guides/util/escape-html)

  - [Get the absolute path of the current file](https://bun.sh/guides/util/import-meta-path)

  - [Get the absolute path to the current entrypoint](https://bun.sh/guides/util/main)

  - [Get the current Bun version](https://bun.sh/guides/util/version)

  - [Get the directory of the current file](https://bun.sh/guides/util/import-meta-dir)

  - [Get the file name of the current file](https://bun.sh/guides/util/import-meta-file)

  - [Get the path to an executable bin file](https://bun.sh/guides/util/which-path-to-executable-bin)

  - [Hash a password](https://bun.sh/guides/util/hash-a-password)

  - [Sleep for a fixed number of milliseconds](https://bun.sh/guides/util/sleep)

- WebSocket

  - [Build a publish-subscribe WebSocket server](https://bun.sh/guides/websocket/pubsub)

  - [Build a simple WebSocket server](https://bun.sh/guides/websocket/simple)

  - [Enable compression for WebSocket messages](https://bun.sh/guides/websocket/compression)

  - [Set per-socket contextual data on a WebSocket](https://bun.sh/guides/websocket/context)

- Write file

  - [Append content to a file](https://bun.sh/guides/write-file/append)

  - [Copy a file to another location](https://bun.sh/guides/write-file/file-cp)

  - [Delete a file](https://bun.sh/guides/write-file/unlink)

  - [Write a Blob to a file](https://bun.sh/guides/write-file/blob)

  - [Write a file incrementally](https://bun.sh/guides/write-file/filesink)

  - [Write a file to stdout](https://bun.sh/guides/write-file/cat)

  - [Write a ReadableStream to a file](https://bun.sh/guides/write-file/stream)

  - [Write a Response to a file](https://bun.sh/guides/write-file/response)

  - [Write a string to a file](https://bun.sh/guides/write-file/basic)

  - [Write to stdout](https://bun.sh/guides/write-file/stdout)

## Contributing

Refer to the [Project > Contributing](https://bun.sh/docs/project/contributing) guide to start contributing to Bun.

## License

Refer to the [Project > License](https://bun.sh/docs/project/licensing) page for information about Bun's licensing.