Online Tool Store
JavaScript Formatter
Reformat minified or messy JavaScript into readable, indented code with your choice of indent style, entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
A lightweight, bracket-based reformatter — not a full parser, so it won't catch syntax errors the way a linter would.
How the JavaScript formatter works
- Paste minified or messy JavaScript.
- Choose your preferred indent style — 2 spaces, 4 spaces, or tabs.
- The tool reformats it with line breaks and indentation based on bracket depth, ready to copy.
FAQ
Does this fix syntax errors?
No — this is a formatter, not a linter or parser. It reindents based on bracket depth and doesn't validate that your JavaScript is actually correct. Broken code will still come out reformatted, just as broken.
Will it work on minified code from any source?
It handles typical minified JavaScript well, since it tracks strings, template literals, and comments carefully so brackets inside them are never mistaken for code structure. Extremely dense or unusually obfuscated code may format less cleanly.
Does it rename variables or change the logic?
No — only whitespace, line breaks, and indentation are changed. Every variable name, string, and expression stays exactly as written.
Is my code sent anywhere?
No. Formatting happens entirely in your browser as you type — nothing is sent to Online Tool Store or any other server.
How we compare
| Feature | Online Tool Store | Prettier Playground | Browser DevTools "pretty-print" |
|---|---|---|---|
| No install or config needed | ✓ | ✓ | Requires opening DevTools |
| Instant as you paste | ✓ | ✓ | ✓ |
| Choice of indent style | ✓ | ✓ | Fixed style |
For a quick pretty-print without opening dev tools or installing a package, the Online Tool Store JavaScript Formatter reformats pasted code instantly.