JSON Validator
Check whether your JSON is valid and see errors clearly.
What this tool does
JSON Validator checks whether your text is valid JSON, updating live as you type. When it's invalid, the parser's error message helps you find the problem.
How to use
- Paste or type JSON into the input box.
- The status shows Valid or the exact error.
Notes
- Everything runs locally — your data is never uploaded.
- To reformat valid JSON, use the JSON Formatter.
Frequently asked questions
How does validation work?
The tool parses your JSON in your browser as you type. If parsing fails, it shows the error so you can fix it.
Is my data uploaded?
No. Validation is entirely local. Nothing is sent to a server.
Does it check against a schema?
No. It checks that the text is syntactically valid JSON. Schema validation is a separate concern.