Deno is an open-source developer tools & cli tool — Runtime for JavaScript and TypeScript built on V8, with built-in tooling. It is written in Rust.

Is Deno free and open source?

Yes. Deno is free and open source, released under the MIT license. You can view and contribute to the source at https://github.com/denoland/deno.

What language is Deno written in?

Deno is primarily written in Rust.

Other open-source developer tools & cli tools on OSSDrop include Oh My Zsh, VS Code, MarkItDown, Go.

Curated

Runtime for JavaScript and TypeScript built on V8, with built-in tooling.

Developer Tools & CLI·MIT·Rust·108.3k stars·v2.9.5·added 2026-08-10

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[![Deno on OSSDrop](https://ossdrop.com/badge/deno)](https://ossdrop.com/tool/deno)

What is Deno?
Deno is an open-source developer tools & cli tool — Runtime for JavaScript and TypeScript built on V8, with built-in tooling. It is written in Rust.
Is Deno free and open source?
Yes. Deno is free and open source, released under the MIT license. You can view and contribute to the source at https://github.com/denoland/deno.
What language is Deno written in?
Deno is primarily written in Rust.
What are open-source alternatives to Deno?
Other open-source developer tools & cli tools on OSSDrop include Oh My Zsh, VS Code, MarkItDown, Go.

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