Paste your JavaScript, pick your options, go.
Drop in a .js file or paste raw JavaScript, choose your indentation and sorting, then format, minify, or just validate. Everything runs on your device — nothing is uploaded.
Drop a .js file here or tap to browse
Or paste your JavaScript directly below
Switch to TypeScript output to add type annotations based on your JS code.
Auto-fix adds missing semicolons, removes trailing commas, and normalizes quotes before validating.
Four steps, clean JavaScript.
No manual required — here's the entire flow.
Add your JavaScript
Paste your JavaScript into the box or drop in a .js file. It loads straight into the input area.
Set your options
Choose an indent size and turn on Sort keys A→Z if you want every object's keys reordered alphabetically.
Format or minify
Tap Format JS for a readable, color-coded layout, or Minify to collapse it to a single compact line.
Copy or download
Copy the result to your clipboard or download it as a .js file. Stats on size, lines, and functions are included.
Built for reading, not just printing.
The details that make debugging and cleaning up JavaScript faster, without ever leaving your browser.
Runs on your device
Parsing, formatting and minifying all happen locally in JavaScript. Your code never leaves your device.
Precise error detection
Invalid JavaScript gets pinpointed to the exact line and column, so you're not guessing where the syntax broke.
Advanced formatting
Choose 2 spaces, 4 spaces or tabs, sort keys alphabetically, and read color-coded, easy-to-scan output.
Questions people actually ask.
The short answers — with the long ones one tap away.
How do I format JavaScript with this tool?+
Paste your JavaScript into the box, or drop in a .js file. Pick your indent size and any options, then tap Format JS. The beautified, color-coded result appears on the right, ready to copy or download.
Is my JavaScript uploaded to a server?+
No. Formatting, validating and minifying all happen locally in your browser using JavaScript. Your code never leaves your device, so it's safe to use with private or sensitive scripts.
Can this tool find errors in invalid JavaScript?+
Yes. If your JavaScript has a syntax error, the tool reports what went wrong along with the exact line and column where the problem starts, so you can jump straight to the fix.
Can I minify JavaScript instead of formatting it?+
Yes. Tap Minify to collapse your JavaScript into a single compact line with minimal whitespace — useful for shrinking script size before deploying to production.
Can I sort the keys in my JavaScript object literals?+
Yes. Turn on Sort keys A→Z before formatting, and every object literal's keys are reordered alphabetically at every level — which makes diffing two scripts much easier.
What indentation options are available?+
You can choose 2 spaces, 4 spaces, or a tab character for indentation. Minified output ignores this setting since it removes all whitespace.
Can this tool fix broken JavaScript automatically?+
Yes. Turning on Auto-fix common errors adds missing semicolons, removes trailing commas, and converts single-quoted strings to double-quoted ones before validating — which resolves many of the small mistakes that break strict JavaScript.
Is this JavaScript formatter free to use?+
Yes, it's completely free with no account, no sign-up, and no limit on how many times you use it.