Can it detect JSON errors?

Yes — validation mode shows the exact line and type of syntax error.

Yes — minify mode removes all whitespace for compact storage or transmission.

Is there a size limit?

No — handles JSON files of any size.

Free JSON Formatter & Validator — Beautify JSON Online

Format, validate, and minify JSON data with our free JSON Formatter. Paste raw or minified JSON to auto-indent and beautify it with proper formatting and syntax highlighting. Click validate to check for syntax errors with clear error messages pointing to the problematic line. Switch to minify mode to compress JSON to a single line for production use. One-click copy to clipboard. Essential for developers, API testers, and data engineers.

✦ FreeNo sign-upBrowser-onlyNo data uploaded

Input JSON

Output

How to use the JSON Formatter

Open the tool — Visit this page in any browser. No account, download, or installation required. Works on desktop, tablet, and mobile.
Enter your content — Format, validate, and minify JSON data with our free JSON Formatter.
Get your result instantly — All processing happens in your browser. Copy, download, or share your result immediately. Your data never leaves your device.

Frequently Asked Questions

Related Tools

Markdown Editor

Write Markdown with live HTML preview — download .md file

Password Generator

Length slider, char sets, strength meter, bulk gen

Word Counter

Live word, char, sentence & reading time stats