JSON Validator
Paste JSON to check whether it's valid, with a specific error message if it isn't.
How to validate JSON
- Paste your JSON.
- Tap Validate, or just keep typing — it checks live.
- Read the result: valid, or exactly what's wrong.
Frequently asked questions
Where does the error message come from?
Directly from the browser's own JSON parser, so it matches what would happen in real code.
Can this also format my JSON?
For formatting or minifying, use the JSON Formatter tool instead.