JSON Validator

Validate JSON and get helpful error messages

Check whether your JSON is valid and get a helpful error message when it is not.

JSON to validate

Privacy: JSON Validator runs completely in your browser. Your input never leaves your device.

JSON Validator FAQ

Is JSON Validator free to use?

Yes, this tool is completely free. There are no fees, subscriptions, or limits — open the page and use it as much as you like.

Does JSON Validator upload my data?

No. JSON Validator runs entirely in your browser on your own device. Your text and numbers never leave your computer.

Does JSON Validator work on mobile?

Yes. The tool is fully responsive and works on Android, iPhone, tablets, laptops, and desktop computers.