The page loads its dedicated JavaScript formatting engine only when you click Beautify. It recognizes strings, comments, template literals, regular expressions, nested expressions and modern operators, so punctuation inside those constructs stays intact.
Private browser utility / Developer
Free JavaScript Beautifier
Runs entirely in your browser - no upload, no sign-up.
Beautified JavaScript
Paste JavaScript, then beautify it
What does a JavaScript beautifier do?
A JavaScript beautifier turns compressed or inconsistently styled code into a readable layout with steady spacing, indentation and line breaks. This formatter handles modern JavaScript, comments, regular expressions and template literals, with controls for indentation, braces, blank lines and wrapping. Your source stays in your browser and is never executed.
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How to use
- 01Paste JavaScript
Add messy, minified or inconsistently styled JavaScript to the input editor.
- 02Choose formatting options
Set indentation and optional line wrapping, choose a brace style, and decide whether to keep blank lines.
- 03Beautify the code
Click Beautify JavaScript or press Control-Enter or Command-Enter to create a clean, readable version.
- 04Copy or download
Review the formatted output, copy it to the clipboard or download it as beautified.js.
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Who it's for
- Developers turning a compressed bundle or copied browser snippet into readable code for inspection.
- Code reviewers normalizing a small example before discussing behavior, naming or control flow.
- Students making nested functions, objects and conditions easier to trace while learning JavaScript.
- Support and QA teams cleaning reproduction code before adding it to a ticket or bug report.
FAQ
Is my JavaScript uploaded or executed?
No. The formatter processes text locally in your browser and does not run the code you paste. It does not send your source to a formatting API, making it useful for private snippets. As with any browser page, avoid pasting secrets that do not need to be shared.
Is the JavaScript beautifier free?
Yes. The tool is free to use without an account, installation or usage quota. You can format code, change the available style options, copy the result and download a JavaScript file directly from the page.
How much JavaScript can I beautify?
There is no fixed character limit. Large production bundles depend on your device memory and can take longer to parse, while ordinary files and snippets should finish quickly. For very large projects, use Prettier in your editor or build pipeline instead.
Does this formatter support modern JavaScript and JSX?
It handles modern JavaScript syntax such as modules, classes, optional chaining, async functions, template literals and regular expressions. It is intended for JavaScript rather than JSX or TypeScript, and it does not perform type-aware formatting.
Can beautifying JavaScript change how it works?
The beautifier changes layout rather than intentionally rewriting identifiers or expressions. Formatting is not a compiler, validator, linter or security audit, so you should still test important code in its normal runtime and review unfamiliar scripts before using them.
Does a successful result mean the JavaScript is valid?
No. This tool focuses on readable layout and can produce output from incomplete snippets. It does not prove that the code compiles or behaves correctly. Run formatted code through your project's parser, type checker, linter and tests when correctness matters.