Open Source v1.4.4 ✓ Checksum Published

Download Bun JavaScript Runtime for Windows PC v1.4.4 for Windows PC

Name: Bun JavaScript Runtime for Windows PC
Availability: InStock
Author: Oven (Jarred Sumner)

Bun is the all-in-one JavaScript toolkit famous for raw speed — runtime, package manager, bundler and test runner in a single binary that installs npm...

⬇ Direct Download (52.2 MB)

Technical Specifications & System Requirements

Developer Oven (Jarred Sumner)

Platform & OS Windows 10 / 11 (64-bit)

Package Size 52.2 MB

Architecture x64 (64-bit)

Package Format ZIP Archive

Security Verification SHA-256 checksum published

SHA-256 Cryptographic Checksum Computed from the file we serve

              cd2c0fccc78f3ede1f50ca827a15f063eda13d4d150a3d0674f4f6e323d864a5
            

              $ Get-FileHash .\bun-javascript-runtime-pc.exe -Algorithm SHA256
            

Software notes

The Bottom Line: Bun's reputation rests on one demo that never gets old: watching 'bun install' finish a large project's dependencies in the time npm spends resolving the tree. The speed is systemic, not a trick — the package manager uses a global cache and hardlinks, the runtime (built on JavaScriptCore, the Safari engine) starts and executes fast, and the bundler and transpiler are native code all the way down. For day-to-day development the consolidation matters as much as the velocity: runtime, package manager, bundler, test runner, and .env loading are one binary with one mental model, and it runs TypeScript files directly, so small scripts need zero project scaffolding. Windows support was Bun's rough edge in its first years — it arrived later than macOS/Linux and carried more quirks — but current releases are fully supported official builds, and the gap has closed to the point where most tooling works identically. Remaining caveats are compatibility tail-cases: a few npm packages lean on obscure Node/V8 behaviors that Bun's JavaScriptCore base implements differently, and enterprise environments standardized on Node will treat Bun as a dev-side accelerator rather than a production runtime at first. That is in fact the sweet spot: use Bun locally for installs and scripts today, where its speed is undeniable and the risk is zero, and let your confidence grow from there.

Features

Dramatically faster package installs than npm/yarn/pnpm thanks to a global cache — the single most felt upgrade in daily JavaScript work.
One binary is the whole toolkit: runtime, package manager, bundler, transpiler, and test runner, with a coherent CLI.
Runs TypeScript and JSX natively with no configuration, and loads .env files automatically — scripts need no scaffolding.
Strong Node.js compatibility: most npm packages and Node APIs work, so it slots into existing projects instead of demanding a rewrite.
This is the official Windows x64 build from the Bun GitHub releases by Oven, the team behind the project.

Considerations

Windows support matured later than macOS/Linux; rare edge-case bugs still surface on Windows first in new releases.
A small tail of packages depending on V8-specific behavior can behave differently on Bun's JavaScriptCore engine.
Production adoption is still growing — many teams use Bun for development speed while keeping Node in deployment, at least for now.

About & Overview: Bun JavaScript Runtime for Windows PC

Bun is an all-in-one JavaScript and TypeScript toolkit — runtime, package manager, bundler, and test runner — written in Zig around Apple's JavaScriptCore engine, and engineered obsessively for speed. 'bun install' resolves and installs npm packages dramatically faster than npm or yarn thanks to a global cache and copy-based installs; 'bun run' executes TypeScript and JSX directly with no transpiler configuration; and the same binary bundles, transpiles, and runs a Jest-compatible test suite. It implements Node.js APIs for drop-in compatibility, loads .env files automatically, and speaks TypeScript and ESM/CJS without ceremony. This download is the official Windows x64 build from Bun's GitHub releases.

How to Install & Verify Bun JavaScript Runtime for Windows PC

STEP 1

Download and extract the ZIP

Download Bun from the official GitHub link on this page and extract bun.exe to a folder on your PATH.

STEP 2

Verify the install

Open a terminal and run bun --version. Create a test project with bun init, or jump into an existing one.

STEP 3

Use it in an existing project

Run bun install in any Node project to feel the speed difference, then bun run dev / bun test to try the runtime and test runner.

Related Windows PC Software & Alternatives

Deno JavaScript Runtime for Windows PC 2.9.8 • Open Source

Visual Studio Code 1.142.0 • Open Source

Sublime Text 4 (Build 4215) • Shareware / Trial

Beekeeper Studio for Windows PC 6.1.6 • Open Source

jq for Windows PC 1.8.2 • Open Source

Alacritty for Windows PC 0.17.0 • Open Source

Frequently Asked Questions & Verification Guide

Is Bun free?

Yes. Bun is open source (MIT with some LGPL components) and free for any use. Its maker, Oven, was acquired by Anthropic in 2025 and continues developing it openly.

Can Bun replace Node.js?

For most projects, yes — it runs npm packages, implements Node's APIs, and is often several times faster. Test projects with exotic native dependencies before switching production servers.

Why is bun install so fast?

Bun uses a global module cache with hardlinks/copies instead of re-downloading and re-extracting every package per project, plus a resolver written in native code.

How do I install Bun on Windows?

Download the ZIP from this page's official GitHub link, extract bun.exe to a folder on your PATH, and run bun --version. Alternatively, the official PowerShell installer works too, but this page gives you the direct official binary.

Does Bun run TypeScript without a build step?

Yes — TypeScript and JSX are transpiled automatically at run time. bun run index.ts works with no tsconfig or bundler setup.