Format code in your browser

Beautify or minify JSON, HTML, CSS, and JavaScript. No paste to a server; it runs only in this tab.

Before

{ "hello": "world" }

After

Syntax preview

Diff-friendly view

Air-gapped processing: code stays inside this browser tab unless you paste elsewhere.

Do you log pasted snippets?

This deployment ships static assets plus a tiny static file server. Formatting uses bundled libraries in-page.