Is Bun free and open source?

Yes. Bun is free and open source, released under the MIT license. You can view and contribute to the source at https://github.com/oven-sh/bun.

What language is Bun written in?

Bun is primarily written in Rust.

Other open-source web & apis tools on OSSDrop include React, Flutter, Next.js, Supabase.

Curated

Fast all-in-one JavaScript runtime, bundler, test runner, and package manager, built as a drop-in for Node.

Web & APIs·MIT·Rust·96k stars·bun-v1.4.2·added 2026-07-25

Curated listing — added by OSSDrop, not the maker.

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<a href="https://ossdrop.com/tool/bun"><img src="https://ossdrop.com/badge/bun" width="250" height="56" alt="Bun on OSSDrop" /></a>

Markdown

[![Bun on OSSDrop](https://ossdrop.com/badge/bun)](https://ossdrop.com/tool/bun)

What is Bun?
Bun is an open-source web & apis tool — Fast all-in-one JavaScript runtime, bundler, test runner, and package manager, built as a drop-in for Node. It is written in Rust.
Is Bun free and open source?
Yes. Bun is free and open source, released under the MIT license. You can view and contribute to the source at https://github.com/oven-sh/bun.
What language is Bun written in?
Bun is primarily written in Rust.
What are open-source alternatives to Bun?
Other open-source web & apis tools on OSSDrop include React, Flutter, Next.js, Supabase.

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