JS Beautifier

About JS Beautifier

JS Beautifier is a free, browser-based developers tool on AltFTool. Format, beautify, and clean minified or messy JavaScript code with options to adjust tab indentation size and copy output. Everything runs in your browser, so you can use JS Beautifier instantly — no signup, no install, and no uploading your data to a server.

Format, beautify, and clean minified or messy JavaScript code with options to adjust tab indentation size and copy output. Use JS Beautifier online for Dev...

How to use JS Beautifier

1. Open JS Beautifier on AltFTool — it loads instantly in your browser.
2. Add your code or data sample.
3. Choose the formatter, converter, or analyzer action.
4. Review the output and copy the final result.

Why use JS Beautifier

• Debug a copied snippet

  Paste code, payloads, or commands from your editor and clean them before sharing. With JS Beautifier, this stays fast and private in your browser.

• Prepare API payloads

  Convert, format, or inspect data before it goes into tests, docs, or requests. With JS Beautifier, this stays fast and private in your browser.

• Review output quickly

  Use the generated result as a copy-ready starting point for your next task. With JS Beautifier, this stays fast and private in your browser.

Frequently asked questions

Is JS Beautifier free to use?

Yes. JS Beautifier is available as a free online tool on AltFTool.

What can I use JS Beautifier for?

Format, beautify, and clean minified or messy JavaScript code with options to adjust tab indentation size and copy output.

Does JS Beautifier work on mobile?

Yes. JS Beautifier is designed for modern desktop and mobile browsers.