Bun

Bun is an incredibly fast all-in-one JavaScript toolkit

y-combinatorSummer 2019Developer Tools Open Source 🇺🇸 San Francisco13 people

bun.sh in LinkedIn 𝕏 Twitter

Kleiner Perkins · 2022

AcquiredAnthropic

Jarred Sumner · 1 founder

2026Acquired by Anthropic

Acquired

Team

current

Co-founders

current

Stage

Acquired

Source for Acquired by Anthropic

Profile coverage4 of 8 · missing Funding, Signals, Customers, Stack / tools · last run 8/14/2026

About

Bun is an incredibly fast all-in-one toolkit for building, installing, running, and testing JavaScript and TypeScript. We were born out of frustration with the fragmented, slow JavaScript ecosystem and are on a mission to make JavaScript development faster and more productive.

Founder

Jarred Sumner

Founder

Bun is an all-in-one JavaScript runtime, bundler, package manager, test runner. We're making JavaScript faster. Our current goal is to replace Node.js as the default JavaScript runtime.

in LinkedIn 𝕏 @jarredsumner