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Bun

All-in-one JavaScript runtime, bundler, and package manager

Open SourceFree TierFeaturedAdded Sep 1, 2023

About

Bun is a drop-in Node.js replacement built from scratch in Zig for maximum performance. It bundles a JavaScript/TypeScript runtime, bundler, transpiler, package manager, and test runner into a single executable. Bun installs npm packages up to 25x faster than npm, starts servers 3x faster than Node.js, and natively supports TypeScript without configuration. It's compatible with most Node.js APIs and npm packages, making migration straightforward.

Tags

javascript-runtimepackage-managerbundlerperformancetypescript

Origin Story

By Jarred Sumner

The Problem

JavaScript developers need separate tools for runtime, bundling, transpiling, and package management — all slower than they should be.

Building It

Started 2021, released Bun 1.0 in September 2023. Raised $7M from investors. Going mainstream in 2025-2026.

What It Means

Demonstrates that JavaScript tooling performance can be dramatically improved by rethinking from the ground up.

The Dream

Make JavaScript the fastest and most productive language ecosystem by eliminating tooling friction.

Pricing

ModelOpen Source
Free tierAvailable

Completely free and open-source under the MIT license.

View pricing

Category

Developer Tools

Problems Solved

  • Slow Npm Installs
  • Node Startup Performance
  • Needing Separate Bundler Transpiler Runtime

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