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JavaScript Beautifier

Beautify JavaScript for readability.

Beautify JavaScript for readability.

Accepts:JS→Outputs:JS
Quick start: Paste your minified, compressed, or poorly formatted JavaScript into the input area. → Click 'Beautify' to apply proper indentation, spacing, and line breaks. → Review the formatted output — function bodies, control flow, and expressions are clearly structured.

Supported formats

Input formats
JS
Output formats
JS

How to use JavaScript Beautifier

  1. 1

    Paste your minified, compressed, or poorly formatted JavaScript into the input area.

  2. 2

    Click 'Beautify' to apply proper indentation, spacing, and line breaks.

  3. 3

    Review the formatted output — function bodies, control flow, and expressions are clearly structured.

  4. 4

    Copy the beautified code with one click for further editing or debugging.

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Why use JavaScript Beautifier?

  • Unminifies compressed JavaScript into readable, properly indented source code.
  • Supports ES6+ syntax including arrow functions, template literals, destructuring, and modules.
  • Handles large scripts without performance issues on modern devices.
  • Runs entirely in your browser — your source code is never sent to a server.

Common use cases

  • Debug minified production JavaScript by expanding it into readable, structured code.
  • Format auto-generated or transpiled code before conducting a code review.
  • Clean up inconsistently formatted scripts inherited from another developer or project.
  • Prepare JavaScript code snippets for blog posts, documentation, or educational materials.

Limitations & things to know

  • Does not validate JavaScript syntax, only reformats it
  • JSX and TypeScript may not format perfectly

About JavaScript Beautifier

Minified JavaScript is virtually impossible to read and debug — variable names may be mangled, whitespace is stripped, and everything runs together on a single line. Xevon Tools' JavaScript Beautifier reverses this by applying proper indentation, spacing, and line breaks to restore a readable structure. The tool supports ES6+ syntax including arrow functions, template literals, destructuring, async/await, and module imports. It handles large scripts without performance issues and runs entirely in your browser, so your source code stays private. This is essential for debugging production bundles, reviewing auto-generated or transpiled code, cleaning up inherited codebases, and preparing code samples for documentation. For the inverse operation, use the companion JavaScript Minifier to compress code for production.

Frequently asked questions

Yes. The beautifier handles modern JavaScript features including arrow functions, template literals, destructuring, async/await, optional chaining, and ES modules.
TypeScript and JSX may partially format but are not fully supported. The tool is optimized for standard JavaScript. Syntax-specific constructs may not indent perfectly.
No. The tool reformats the code as-is without validating syntax. If the input has errors, they will remain in the output — but at least they will be easier to spot with proper formatting.
Yes. Use the companion JavaScript Minifier tool to compress JavaScript for production by removing whitespace, comments, and optionally mangling variable names.

Your files never leave your device

Every tool on Xevon Tools runs 100% in your browser. No uploads, no servers, no tracking. Free forever.

Learn more

Embed JavaScript Beautifier on your site

Add this tool to your own website, blog, or internal tool page with one line of code. Free to use, no attribution required (but appreciated).

<iframe src="https://www.xevontools.com/embed/js-beautifier" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px;" title="JavaScript Beautifier — Xevon Tools"></iframe>
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