A Unix environment in a single HTML file (420 KB)

In plain words

Shiro is a Unix-like environment that runs entirely in the browser as a single HTML file. It includes a shell, filesystem, git, npm, node, vi editor, and over 200 commands—all implemented in JavaScript with IndexedDB for persistent storage. Users can perform tasks like npm installation, node execution, and git workflows directly in their browser without server-side dependencies.

written from the facts on this page · September 2026

From the sources

In the maker’s words, at launch

I built a browser-native Unix environment - shell, filesystem, git, npm, node, vi, 200+ commands. Everything is JavaScript running client-side with IndexedDB for persistence. The whole thing builds to a single static HTML file (~420 KB gzipped). Try it: https://shiro.computer For interactive demos showing…

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