JavaScript Formatter
Beautify or minify JavaScript with custom indentation.
Input
Output
This is a fast, in-browser formatter for everyday tidying. For complex source files, a dedicated build-time formatter may produce different results.
What Is the JavaScript Formatter?
The JavaScript Formatter is a free online tool that lets you beautify or minify JavaScript with custom indentation. It runs entirely in your browser — your text and files never leave your device, so it's fast and private. There's nothing to install and no sign-up required.
How It Works
Using the JavaScript Formatter takes seconds. Paste or type your content into the input area (or upload a file where supported), adjust any options to fit your needs, and the result updates instantly. You can then copy the output to your clipboard, download it, or clear everything and start again. Because all processing happens locally with JavaScript, it works offline once the page has loaded.
When to Use It
Reach for the JavaScript Formatter whenever you need a quick, reliable way to beautify or minify JavaScript with custom indentation. It's popular with writers, students, developers, marketers and anyone who works with code & data day to day. Bookmark it alongside the other Code & Data in our toolbox so it's always one click away.
Frequently Asked Questions
- Is the JavaScript Formatter free to use?
- Yes. Every tool on the site is completely free, with no account, login or download required.
- Is my data private?
- Absolutely. The JavaScript Formatter processes everything locally in your browser. Your text and files are never uploaded to a server, so your data stays on your device.
- Does it work on mobile?
- Yes. The JavaScript Formatter is fully responsive and works on phones, tablets and desktops in any modern browser.
- Do I need to install anything?
- No installation is needed — it runs in the browser. We also offer an optional browser extension and mobile app for quick access to popular conversions.
Last reviewed: 2026-06-27