JavaScript Beautifier
Format messy or minified JavaScript into clean, readable code. Powered by Prettier, so the output matches what your editor would produce.
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Format messy, minified or inconsistently indented JavaScript into clean readable code. This uses Prettier - the same formatter most editors and CI pipelines run - so the output matches what your team's tooling would produce.
Frequently asked questions
Yes, it runs Prettier's standalone build directly in your browser. The output is identical to what you would get from a local Prettier install with the same settings, so it will not fight your project's formatting.
No. Prettier only reprints the code from its parsed syntax tree - it never rewrites logic. If your code has a syntax error the tool reports the exact line and column instead of guessing, because formatting broken code would produce misleading output.
It handles modern JavaScript and JSX. Minified single-line files reformat perfectly - that is one of the most common uses. For heavy TypeScript-specific syntax, results may vary since the parser here targets JavaScript.
No. Everything runs in your browser, so proprietary or unreleased code never leaves your machine. The tool also works offline once the page has loaded.