JSON Validator
Free online JSON validator tool. Check JSON syntax for errors, find and fix issues instantly. Validate JSON data in your browser with detailed error messages.
Click "Validate" to check your JSON
Before & After
{"name":"John","age":30, "email":john@example.com}✓ Valid JSON
{"name":"John","age":30,"email":"john@example.com"}How to Validate JSON
Paste your JSON
Paste your JSON data into the input editor. You can also upload a .json file.
Click Validate
Click the "Validate" button to check your JSON for syntax errors.
Review Results
If valid, you will see a success message. If errors are found, they will be highlighted with line numbers.
Why Use Our JSON Validator?
Detailed Error Messages
Get precise error messages with line and column numbers to quickly locate and fix issues.
Real-Time Validation
See validation results instantly as you type, with inline error highlighting.
100% Browser-Based
All validation happens locally. Your data never leaves your browser.
File Upload Support
Upload .json files and validate them with one click.
Error Highlighting
Errors are highlighted directly in the editor for easy identification.
Free & Unlimited
No limits, no sign-up. Validate as much JSON as you need.
When to Validate JSON
| Scenario | Description |
|---|---|
| API Development | Validate JSON request and response payloads before sending or processing them. |
| Configuration Files | Check JSON configuration files for syntax errors before deployment. |
| Data Migration | Verify JSON data integrity during migration or import processes. |
| Debugging | Quickly find syntax errors in JSON that is causing application failures. |