How it works
The JavaScript Formatter (JS Beautifier) takes minified, obfuscated, or poorly indented JavaScript and reformats it with consistent indentation, newlines, and spacing — transforming a single-line bundle back into readable source code.
Minified JavaScript from a CDN, a browser DevTools Sources panel, or a legacy project without source maps is completely unreadable. The JS Formatter reverse-engineers the formatting to produce readable code you can navigate, debug, and understand.
How to use it: paste any JavaScript — including minified bundles, arrow functions, template literals, destructuring, async/await, and modern ES2022+ syntax. The formatter parses the AST (abstract syntax tree) and reconstructs it with proper formatting. Choose between 2-space, 4-space, or tab indentation.
What formatting is applied: each statement on its own line, consistent indentation per block, space after keywords (if (, function (, while (), space around binary operators (a + b, x === y), opening braces on the same line as the block opener (K&R style), and closing braces on their own line.
Limitation: the formatter restructures layout but cannot undo minification's variable renaming (a, b, c instead of descriptive names). For that, you need a dedicated deobfuscator. The formatter makes the structure readable; naming requires source maps or reverse engineering.
Use cases: reading third-party scripts to understand their behavior, debugging a minified error stack trace by formatting the source, reviewing legacy code that was committed without formatting, preparing JavaScript for documentation, and formatting inline script tags from HTML sources.
Frequently Asked Questions
- TypeScript type annotations, interfaces, generics, and decorators are handled by the formatter. The output preserves all TypeScript-specific syntax.
- All comments are preserved — single-line (//) and block (/* */) comments are kept in place. JSDoc comments (/** */) are preserved with their original formatting.
- JSX syntax within .jsx or .tsx files is supported. JSX elements are formatted with proper indentation and attribute alignment.
- No. The formatter restructures whitespace and indentation but never renames variables, changes identifiers, or alters program logic. Minified variable names like a, b, c remain unchanged.