JS Beautifier
Reformat minified or messy JavaScript into readable code.
🔒 Runs entirely in your browser — nothing is uploaded.
How JS Beautifier works
How does the JS beautifier work?
It runs your code through the js-beautify library, loaded from a CDN, which re-indents and reformats JavaScript according to standard formatting conventions. You can choose an indent_size of 2 or 4 spaces from the dropdown before beautifying.
What is it useful for?
It is handy for unminifying bundled or obfuscated JavaScript to see what it actually does, or for normalizing inconsistently formatted code someone pasted into a ticket or chat.
Does it check the code for errors?
It only reformats - it does not execute or lint your code. If the input has a syntax error, the beautifier library throws and the tool surfaces that error message instead of output, which doubles as a rough syntax check.