JavaScript Beautifier

It parses your JavaScript and reformats it with consistent indentation, line breaks after brackets and semicolons, and proper spacing. Everything runs locally in your browser - your code never leaves your computer.

Absolutely. All formatting is done client-side in your browser. No data is uploaded to any server. Your source code stays entirely private.

The beautifier uses 2-space indentation for JavaScript, which is the most common convention. It adds consistent line breaks after semicolons, opening braces, and between logical blocks of code.

No. Beautifying only changes whitespace and formatting — the code's logic, variable names, and execution behavior remain identical. It's purely a readability improvement.

No. The beautifier formats the structure of your code but doesn't fix syntax errors. If your JavaScript has missing brackets, invalid syntax, or other errors, you'll need to fix those first. The formatted output will preserve your code's structure, errors and all.

The beautifier handles all modern JavaScript including ES6+ syntax (arrow functions, template literals, destructuring, async/await, classes, and modules).

Yes, it handles large JS files efficiently. For files over ~50MB, your browser's memory limits may apply. For most web application bundles, it's nearly instant.