js-formatter.online is a small, focused tool: paste JavaScript or JSON, get it back formatted or minified, without signing up for anything or sending your code to a server.
Most "online formatter" sites bury a simple textarea under ads, popups and slow page loads. We wanted something a developer could bookmark and trust — fast to open, obvious to use, and honest about what happens to your code (nothing: it stays in your browser tab).
The beautifier is built on Prettier, the widely used opinionated JavaScript formatter, loaded directly in your browser. Formatting, minifying and JSON validation all run as client-side JavaScript — there's no backend processing your input, which is also why the tool works even on a slow connection once the page has loaded.
Students learning JavaScript who want to see clean code, developers quickly checking a snippet from Stack Overflow or a bug report, and anyone who needs to tidy up minified or copy-pasted code before reading it properly.
We're gradually expanding the blog with practical guides on formatting, linting and JavaScript style — real explanations, not filler. If there's a feature you'd like to see in the tool, get in touch.