JSON Validator
Validate JSON instantly with precise error messages. Get exact line and column numbers for any syntax errors.
Validation Features
Catch every JSON error with precise diagnostics.
Real-Time Validation
JSON is validated as you type with instant feedback. Errors are highlighted directly in the editor.
Precise Error Location
Get exact line and column numbers for syntax errors. Click the error to jump directly to the problem.
Auto-Fix Support
Common errors like trailing commas, single quotes, and unquoted keys can be fixed automatically.
JSON Validator FAQ
What JSON errors can it detect?
It detects all JSON syntax errors including missing commas, unclosed brackets, invalid values, duplicate keys, trailing commas, and more.
What can Auto-Fix repair?
Auto-Fix handles trailing commas, single quotes to double quotes, unquoted keys, JavaScript comments, BOM characters, and JS literals like undefined/NaN/Infinity.
Is validation done locally?
Yes, all validation happens in your browser. No data is sent to any server.