JSON Validator
Check whether a JSON document is syntactically valid. When it is not, you get the exact error and position so you can fix it without guessing.
How to use
- Paste the JSON you want to check.
- Click Validate.
- Read the result: valid JSON reports success with key counts; invalid JSON reports the exact syntax error.
Examples
Trailing comma (invalid)
Input: {"a": 1,}
Output: Invalid: Unexpected token } in JSON at position 9
Frequently asked questions
Does validation check against a schema?
This tool checks JSON syntax only (RFC 8259). JSON Schema validation is a separate feature we may add later.
Is my data safe?
Yes. Validation is performed locally in your browser; no data is transmitted.