Download Bun 1.4.0 for Windows

Bun 1.4.0 for Windows

Windows
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August 26, 2026

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Bun for Windows is the JavaScript runtime that changes how fast your development workflow can actually feel. Bun for Windows 1.4.0 runs JavaScript and TypeScript natively, bundles your code, manages packages, and runs tests all from one single tool without needing Node.js, Webpack, or a separate test runner standing alongside it.

I switched to it because the speed difference is not subtle at all and once you experience installing packages in seconds instead of minutes going back feels genuinely painful. It handles everything a modern JavaScript developer needs and it handles all of it faster than anything else currently available on Windows.

Bun Overview

Bun for Windows is an all in one JavaScript toolkit built for developers who are tired of slow installs, slow builds, and a fragmented toolchain that requires five different tools to do what one should handle. It serves as a runtime, a package manager, a bundler, and a test runner simultaneously without any configuration overhead to get started. It is built on the JavaScriptCore engine rather than V8 which is a large part of why its performance numbers consistently beat Node.js and Deno across almost every benchmark that matters to real development workflows. It supports TypeScript and JSX natively without any transpilation step required meaning you run your files directly and Bun handles the rest invisibly.

Key Features of Bun for Windows

Native JavaScript and TypeScript runtime
Built in package manager faster than npm and yarn
Built in bundler replacing Webpack and esbuild
Built in test runner with Jest compatible API
JavaScriptCore engine for maximum performance
Native TypeScript and JSX support without config
Node.js API compatibility for existing projects
Hot reloading with the watch flag
SQLite support built directly into the runtime
Web standard API support including fetch and WebSocket
Workspace support for monorepo projects
Plugin system for extending bundler behavior
Cross platform binary compilation support
Dotenv loading without any extra package
Fully optimized for Windows 10 and Windows 11

What’s New in Bun 1.4.0

Windows support significantly improved with better native API compatibility
Package installation speed increased with smarter caching behavior
Bundler output improved with smaller and more optimized builds
Node.js compatibility expanded covering more core modules reliably
Several bug fixes and stability improvements across runtime and bundler

System Requirements

OS: Windows 10 or later
RAM: At least 4 GB with 8 GB recommended
Storage: 200 MB of free space
Processor: Intel or AMD 64 bit processor supported

How to Install Bun on Windows

Download Bun for Windows 1.4.0 full version.
Extract the downloaded file.
Open PowerShell as administrator.
Run the Bun installer command.
Confirm the installation path when prompted.
Verify by running bun –version in your terminal.

How to Download Bun Using Windows

Visit the official Bun website at bun.sh.
Click the Download for Windows button on the homepage.
Wait for the installer file to finish downloading.
Open your Downloads folder.
Run the installer file to begin installation.

Supported Websites

Bun Official Website
GitHub Official Page
npm Registry Compatible
Softpedia
Fosshub
MajorGeeks
1000+ other trusted sources

Why Use Bun for Windows?

Bun for Windows solves a real problem that every JavaScript developer on Windows knows well which is a toolchain that feels slow, fragmented, and unnecessarily complicated for what it actually does. Package installs that used to take two minutes finish in under fifteen seconds. TypeScript files run directly without a build step. Tests execute through the same tool you already have open.

The bundler produces smaller output faster than the dedicated bundlers most projects currently use. Every part of the JavaScript development workflow gets measurably faster the moment you switch to Bun for Windows and the fact that it replaces four separate tools with one binary makes your setup dramatically cleaner and simpler at the same time. Developers who try it for one project almost never go back to their previous setup.

Bun vs Other JavaScript Runtimes

Feature	Bun for Windows	Others
Built in Package Manager	Yes	No
Built in Bundler	Yes	No
Built in Test Runner	Yes	No
Native TypeScript Support	Yes	Limited
Node.js Compatibility	Yes	Limited
Windows Optimized	Yes	No

Frequently Asked Questions

Here are the most asked questions about Bun for Windows:

My existing Node.js project throws errors when I run it with Bun for Windows, how do I fix this?

Bun for Windows covers the vast majority of Node.js core APIs but a small number of less common modules are still being completed as compatibility expands. Open your terminal, run your project with bun run and check the error message for the specific module or API that is failing. Visit the official Bun compatibility page on GitHub which lists every Node.js API and its current support status so you can identify exactly what is missing and either find a compatible alternative package or add a small polyfill that resolves the gap without rewriting any of your existing code.

Bun for Windows installs packages fast but my lockfile keeps conflicting with my teammate's npm lockfile, what should we do?

Bun for Windows generates a bun.lockb binary lockfile which is different from the package-lock.json that npm produces. The cleanest solution for teams mixing both tools is to commit the bun.lockb file for Bun users and add a postinstall script that keeps both lockfiles synchronized when either tool runs an install. Alternatively your team can align on Bun for Windows as the single package manager for the project and remove the npm lockfile entirely which eliminates the conflict permanently and lets everyone benefit from the faster install speeds immediately.

Can Bun for Windows fully replace Node.js for a production server or is it only suitable for development use?

Bun for Windows is production ready for most server side JavaScript workloads and many teams are already running it in production successfully. It handles HTTP servers, database connections, file operations, and background workers reliably with performance that consistently outperforms equivalent Node.js setups under load. The main consideration before switching production infrastructure is verifying that every package your server depends on runs correctly under Bun since ecosystem compatibility, while very broad, is still not one hundred percent complete for every edge case across every available npm package.