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JSON Validator Online
Check if your JSON is valid. Our validator parses your JSON and shows exactly which line has a syntax error so you can fix it quickly. Paste your JSON below — validation is instant.
How to use JSON Validator Online
1
Paste your JSON data into the input box
2
The formatter validates and formats it instantly
3
If there is an error, the line or syntax issue is highlighted
4
Copy the formatted output with the copy button
When to use this tool
- Debugging API responses from web services
- Reading minified JSON from config files
- Validating JSON before using it in code
- Formatting JSON for documentation or sharing
Frequently Asked Questions
What types of JSON errors does it detect?
Missing commas, extra commas, unquoted keys, mismatched brackets, and other syntax errors.
Does it validate JSON Schema?
No — this tool validates JSON syntax only, not JSON Schema compliance.
Can it handle large JSON files?
Yes, up to 1 MB of JSON input.
Is it free?
Yes — completely free with no registration.