JavaScript Beautifier

The JavaScript Beautifier reformats minified, compressed, or poorly indented JS into clean, readable code — proper indentation, consistent quote style, and clear line breaks — so you can actually read and debug it. Paste minified JS, a bundled file, or messy code from anywhere, and get formatted output instantly.

• •Indentation: 2 spaces, 4 spaces, or tabs
• •Quote style: normalize to single quotes, double quotes, or preserve as-is
• •Semicolon insertion: automatically add missing semicolons
• •Comment preservation: keep or strip comments during formatting
• •Chained method breaking: split long .filter().map().reduce() chains onto separate lines
• •Basic syntax validation: flags unmatched braces, parentheses, and brackets as you type

• •Reading a minified production bundle to debug an error in browser DevTools
• •Reformatting code copied from a chat message, PDF, or email that lost its original indentation
• •Standardizing quote style and indentation before a code review
• •Making an obfuscated or bundled third-party script readable enough to understand what it does
• •Cleaning up code generated by another tool before committing it

1. 1.Paste your JavaScript into the input editor, or upload a .js file
2. 2.Choose indentation (2/4 spaces or tabs) and quote style
3. 3.Toggle comment preservation, semicolon insertion, and chained-method breaking as needed
4. 4.Formatted output appears automatically as you type
5. 5.Copy the output or download it as a .js file

• •Heavily minified code with single-letter variable names becomes readable in structure, but variable names themselves aren't restored — a beautifier can't recover meaning that minification discarded
• •Template literals and regular expressions containing brace-like characters are handled carefully, but extremely unusual regex patterns may occasionally throw off indentation
• •The bracket/brace/paren checker flags likely syntax issues but is a heuristic, not a full JavaScript parser — it can't catch every kind of syntax error

• •This is a formatting tool, not a linter — it won't catch logic errors, undefined variables, or ESLint-style issues
• •Extremely large files (multi-MB bundles) may be slow to process in the browser — consider a build-tool-integrated formatter (Prettier) for large-scale codebase formatting
• •For production code style enforcement across a team, a dedicated tool like Prettier or ESLint integrated into your editor/CI is more appropriate than ad hoc browser formatting

If you have readable JavaScript and need to shrink it for production — reducing file size and load time — use the JavaScript Minifier instead. It strips comments and whitespace and shows you the exact size reduction.