What is a JavaScript Formatter?
A JavaScript formatter parses source text and rewrites whitespace and punctuation style so code is easier to scan, review, and maintain.
Text & Formatting
JavaScript formatting guideJavaScript Formatter
Format messy JavaScript into clean, readable code with configurable indentation and developer-friendly output.
JavaScript input
Paste ES5, ES6 modules, classes, async functions, or minified code.
Formatted JavaScript
Readable output with syntax validation before formatting.
Ready to format JavaScript
Paste JavaScript or load a sample. ES modules, classes, async/await, and template literals are supported.
Tip: Press Ctrl+Enter or Command+Enter in the editor to format immediately.JavaScript Formatting Guide
Beautify JavaScript locally without running it
Use this formatter to normalize whitespace, indentation, quotes, semicolons, and wrapping for scripts, modules, components, utilities, and pasted minified snippets.
How JavaScript formatting works
The formatter checks syntax, builds a parser representation, then prints clean JavaScript with your selected indentation, quote, semicolon, trailing comma, and line width settings.
JavaScript Formatter vs Minifier
Formatting expands code for humans. Minifying removes whitespace and shortens output for delivery. Use formatting for review and debugging, not production compression.
Common JavaScript formatting issues
Unclosed strings, missing braces, JSX pasted into a JavaScript-only parser, and incomplete template literals can stop formatting until the syntax is corrected.
Formatting modern ES6+ code
Modules, arrow functions, async/await, classes, private fields, destructuring, optional chaining, nullish coalescing, and template literals are supported as source text.
Why readable code matters
Consistent formatting lowers review friction, makes diffs smaller, and helps developers notice control flow, nested data, and accidental syntax changes faster.
JavaScript Formatter FAQ
Does this JavaScript Formatter execute my code?
No. JavaScript is treated strictly as text input. The formatter parses source text and never uses eval, Function, script injection, or runtime imports from your code.
Can it format modern JavaScript?
Yes. It supports modern ES6+ syntax such as modules, classes, arrow functions, destructuring, optional chaining, and template literals.
Does it support async/await?
Yes. Async functions and await expressions are formatted as normal JavaScript syntax.
What is the difference between formatting and minifying?
Formatting makes code readable with line breaks and indentation. Minifying makes code compact for transfer and usually removes readability.
Can it format minified JavaScript?
Yes. Paste compact JavaScript and format it to recover readable indentation and wrapping, as long as the minified code is syntactically valid.
Does it preserve comments?
Yes. Comments are preserved by default because they can contain licenses, review notes, and important maintenance context.