Free JSON Validator Online
Validate JSON data instantly. Detect syntax errors with line numbers, format your code, and fix common issues.
JSON Editor
Instant Validation
Syntax checking happens as you type, giving you immediate feedback on validity.
Error Positioning
Pinpoints the exact location of syntax errors with line numbers and message guidance.
Auto-Fix Common Issues
Can automatically fix common problems like trailing commas or using single quotes.
Frequently Asked Questions
What is JSON validation?
JSON validation checks if your data follows the strict syntax rules of the JSON format, ensuring it can be parsed by applications.
Why is my JSON invalid?
Common reasons include: missing quotes around keys, using single quotes instead of double quotes, trailing commas, or unescaped characters.
Is my data secure?
Yes! All validation happens locally in your browser. Your data never leaves your device.
Can it format compacted JSON?
Yes, simply click the "Format" button to beautify minified/compacted JSON.