JSON Validator
Check if your JSON is valid and find syntax errors.
How to use
Paste your JSON and click Validate. If it's valid, you'll see a confirmation. If it's not, the tool shows the exact parser error message, which usually names the unexpected character or token and its position in the string.
- Paste the JSON you want to check into the input field.
- Click 'Validate JSON'.
- If invalid, read the error message — it typically points to the exact character position of the problem.
- Fix that spot and re-validate.
About JSON Validator
JSON Validator checks whether a block of JSON is syntactically correct. If it isn't, it shows you the exact error your browser's own JSON parser produces — including where in the string the problem is — rather than leaving you to scan the whole document by eye.
Common Use Cases
- Debugging a JSON parsing error thrown by your application, without adding console logs.
- Checking a config file (like package.json or a .json settings file) before committing it.
- Verifying an API response is well-formed JSON before writing code against it.
- Confirming JSON generated by a script or template is syntactically valid before using it.
Common Mistakes
Frequently Asked Questions
What's the difference between this and the JSON Formatter?
The Formatter re-indents JSON to make it readable but doesn't check correctness on its own. The Validator specifically checks whether the JSON is syntactically valid and tells you exactly what's wrong if it isn't.
Does it check my data against a schema, like required fields?
No — it checks JSON syntax only (is it parseable), not whether the data matches a particular structure or schema.