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JavaScript Formatter

Format and beautify JavaScript code instantly.

JavaScript formatter workspace

Format JavaScript Code

OR

Processed locally in your browser. Your code is never sent to a server.

Output

Paste or upload JavaScript code to format.

Formatted code will appear here.

Formatter ready.

What is a JavaScript Formatter?

A JavaScript Formatter turns compressed or inconsistent JavaScript into readable code with consistent indentation, wrapping, quotes, and semicolon style. It helps developers review functions, modules, classes, async code, objects, arrays, and modern browser JavaScript.

How It Works

Beautify JavaScript source

  1. Paste JavaScript

    Add the JavaScript source you want to clean up.

  2. Adjust style

    Use More Options for indentation, line width, quotes, and semicolons.

  3. Format code

    Prettier parses and formats the code in your browser.

  4. Copy or download

    Copy the formatted JavaScript or download it as a .js file.

Features

Made for quick JavaScript cleanup

  • Modern syntax support

    Formats common modern JavaScript supported by Prettier Babel.

  • Quote and semicolon options

    Choose the common style preferences without adding extra modes.

  • Highlighted output

    Shows clean code on a dark line-numbered result surface.

  • Browser-local processing

    JavaScript is never executed, uploaded, or stored by the tool.

Frequently Asked Questions

Quick answers to common questions about using this tool.

Does the JavaScript Formatter run my code? +

No. JavaScript is parsed and formatted as text only. It is never evaluated or executed by the page.

Does it upload or store JavaScript? +

No. Formatting runs locally in your browser during normal use. PotatoTools does not send your source to a server or store it in browser storage.

Which JavaScript syntax is supported? +

The formatter uses Prettier Babel parsing for common modern JavaScript such as functions, modules, classes, async code, optional chaining, template literals, objects, and arrays.

Does this formatter support TypeScript? +

No. This V1 JavaScript Formatter does not claim TypeScript support. TypeScript can be a separate tool later.

Can I change quotes and semicolons? +

Yes. More Options lets you choose double or single quotes and whether semicolons are printed.

Can I copy or download the formatted JavaScript? +

Yes. After formatting succeeds, you can copy the exact formatted JavaScript or download it as a .js file.

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