JavaScript Beautifier
Turn minified or messy JavaScript into clean, indented code.
How to use the JavaScript Beautifier
- Paste your JavaScript on the left.
- The formatted version appears on the right.
- Copy the readable code.
About the JavaScript Beautifier
The JavaScript Beautifier transforms minified or badly formatted code into clean, properly indented JavaScript. Paste your source on the left and the readable version appears on the right, with consistent indentation, spacing around operators and braces, and each statement on its own line. Dense bundles and one-line minified files become something you can actually follow.
It runs on js-beautify, the same widely used library built into many editors and IDEs, so the formatting matches conventions developers already know rather than a custom style. This is exactly what you want when you are trying to read a third-party script, debug a production bundle, or understand code that arrived with no whitespace at all.
Beautifying is a formatting-only step: it re-indents your code without changing its logic, and it all happens in your browser so nothing is uploaded. Copy the tidy result when you are done. When you are ready to ship, the JavaScript Minifier compresses it safely, and the CSS Beautifier does the same for your stylesheets.
Frequently asked questions
What does the JavaScript beautifier use?
It is built on js-beautify, the same established library found in many editors and IDEs. That gives it predictable, familiar indentation and spacing rather than a one-off custom formatter.
Does beautifying change my code behaviour?
No. It only reformats whitespace and layout. The statements, names and logic are untouched, so the code runs exactly as it did before, just in a far more readable form.
Can it read minified or bundled code?
Yes. Paste a compressed, single-line script and it is expanded into clean, indented code, which is invaluable for debugging a production bundle or studying a third-party library.
Is my JavaScript uploaded to a server?
No. Formatting runs entirely in your browser, so your code never leaves the page. That makes it safe for proprietary or unreleased scripts.
How do I shrink it again for production?
Run the formatted code through the JavaScript Minifier, which strips comments and trims whitespace conservatively so the file is smaller without risking broken behaviour.