Format modern JavaScript with readable indentation and structure.
Your JavaScript is processed locally in the browser. Nothing is uploaded or stored.
Beautifying adds indentation and line breaks for readability. Minifying strips whitespace, renames variables, and removes dead code to shrink file size for production — they're opposite operations.
No — this only touches whitespace and indentation. For identifier mangling and dead-code elimination, use the JavaScript Minifier.
Yes — arrow functions, classes, async/await, destructuring, optional chaining, and other modern syntax all parse and format correctly.
There's no hard size limit — formatting runs in your browser. Multi-megabyte bundles take longer and use more memory than a typical file, but there's no artificial cutoff.
No — whitespace changes don't affect JavaScript semantics.
No — everything runs locally in your browser.