What happens if JSON is invalid?

JSON Formatter

Format, prettify, minify, and validate JSON code with inline error output.

JSON Input

Output

Formula & Calculation Details

Prettifying uses JSON.stringify(JSON.parse(input), null, 2) to indent keys, while minifying stringifies without indentations.

Frequently Asked Questions

The formatter catches syntax errors and outputs the exact error message and position to help you fix it.

Yes, 100%. All processing is performed entirely in your browser using local JavaScript. No code or data is uploaded to our servers, ensuring your data remains completely private.

Yes! Since it runs entirely in the client-side browser, you can continue to use all its features without an active internet connection once the page is loaded.

There is no set limit, but processing extremely large inputs (multiple megabytes) depends on your browser's memory and CPU capacity. It is optimized to handle standard development workflows instantly.

Absolutely. The interface is fully responsive and optimized to provide a premium, smooth coding experience on mobile phones, tablets, and desktop computers.