JavaScript Formatter

Make JavaScript source easier to read. Parsing and formatting do not run your code.

Up to 200,000 characters. UTF-8 files up to 800,000 bytes. Output limit: 4,000,000 characters. Processing time limit: 20 seconds.

Download JavaScript

Your source is processed in your browser and is not uploaded to ToolPixels. This tool does not save your input.

How to use it

  1. Paste JavaScript or open a UTF-8 file. Load the example to try it.
  2. Choose indentation, then select Format JavaScript.
  3. Review the output. If an error appears, correct your input and try again.
  4. Copy the result or download javascript-formatter.js.

Formatting is not execution

Uses Prettier with its Babel parser for JavaScript and JSX. TypeScript is not supported here. Formatting may change quotes, semicolons, and parentheses while retaining parsed meaning. It does not fix program logic, resolve imports, bundle dependencies, or transpile syntax for older browsers.

Only the required local processor is loaded when you run the tool. Large jobs run in a cancellable background worker. Source and results remain text, including scripts, markup, and URLs.

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