What this tool does
Format modern JavaScript, including classes, optional chaining, template literals, and async/await, without executing your code.
- Supports const/let, arrow functions, async/await, template strings, destructuring, optional chaining, and classes.
- Your code is formatted as text and is never run.
- Syntax errors are reported by the parser and no code path is executed.
How to use it
- Paste the JavaScript source code.
- Your input is processed as text; HTML and scripts are not executed.
- Show syntax errors without running your code.
- Fix syntax errors, or copy/download the results.
Common uses
- Clean up compressed or garbled code snippets.
- Unify formatting before code review.
- Locate incomplete expressions with parsing errors.
JavaScript Formatter Features
Format modern JavaScript, including classes, optional chaining, and async/await, with consistent indentation and line breaks. Review the result, then copy or download it.
FAQ
Will the entered code be executed?
Your input is processed as text; HTML and scripts are not executed.
Are optional chains and template strings supported?
Yes. Paste code containing these features to format it.
Why is a semicolon added after formatting?
Current output rules enable semicolons for consistency; this is a typesetting choice, not running input.