JS Formatter
ConverterBeautify or minify JavaScript with proper indentation, handling arrow functions, template literals and modern syntax, with a choice of brace style and quotes.
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About JS Formatter
Format and beautify JavaScript (including ES6+/ES2023) code in your browser with configurable indentation (2, 4, 6, or 8 spaces).Handles all modern JavaScript syntax — arrow functions, async/await, classes, template literals, destructuring, spread operators, optional chaining, nullish coalescing, regular expressions, and JSX. Toggle between beautify mode (clean, readable indented output) and minify mode (compact output for production bundles).Powered by a custom parser that preserves comments and maintains syntactic correctness. Ideal for debugging minified scripts, standardizing team code style, or preparing code snippets for documentation. For example, minified JavaScript is re-indented by statements and scope with syntax highlighting, making errors easier to locate. A common workflow: normalize a messy legacy bundle with this tool before running a linter, so your diffs stay clean and reviews stay fast.
How to Use
- Open the JS Formatter tool
- Select the source and target formats
- Adjust the output options as needed
- Click the Convert button; results appear in real time
- Copy or export the result
Use Cases
- Scope & function cleanup — Expand minified JS by function and scope level with clean indentation for a clear view of closures and callback chains.
- Project standards — Standardize JS code indentation and formatting across your project, cutting review noise.
- Code review — Format JS code before review to make logic structure and changes clearer.
- Minify production code — Switch to minify mode to strip comments and whitespace for smaller build artifacts.
- Debug minified scripts — Restore a one-line CDN script to readable structure and quickly locate the failing point.
FAQ
Does formatting change code logic?
No. Formatting only adjusts indentation and line breaks. JavaScript execution logic, variable names, and structure remain unchanged.
Does it support ES6+ syntax?
Yes. Properly handles arrow functions, template literals, destructuring, async/await, optional chaining, nullish coalescing, and other ES6+ through ES2023 features.
Does it support minification?
Yes. Switch to minify mode to remove comments and excess whitespace for minimized JS output suitable for production builds.
Does it handle regular expressions?
Yes. The lexer distinguishes regex literals from division operators, so /pattern/ is not misread and formatting stays correct.
Can it process TypeScript?
It handles TypeScript type annotations and structure formatting well as a basis for cleanup; for full TS type-aware transforms use a dedicated tool.
Does minifying change semantics?
No. Minifying removes comments, whitespace and line breaks only; variable names and logic are preserved. For aggressive renaming use a dedicated build mangler.