JSON Validator
Free online JSON validator with real-time syntax checking, schema validation, and detailed error reporting. Validate JSON data instantly and ensure compliance with JSON Schema standards.
JSON validation is the process of checking whether your JSON data conforms to the correct syntax and optional schema rules. Proper validation ensures data integrity, prevents runtime errors, and improves API reliability.
Our free JSON validator provides real-time syntax checking, detailed error messages, and optional JSON Schema validation. Simply paste your JSON data to instantly identify issues and get suggestions for fixes.
Common use cases include API development, configuration file validation, data migration testing, and ensuring compliance with JSON Schema standards.
- Real-time syntax validation with line-by-line error reporting
- Support for JSON Schema draft-07 validation rules
- Detailed statistics including object depth, array count, and data size
- One-click formatting and sample data loading
- Secure client-side processing - no data sent to servers
- Mobile-friendly responsive design
JSON Schema provides a powerful way to define the structure, format, and constraints of your JSON data. Our validator supports common schema keywords including type, required, minimum/maximum, pattern matching, and nested object validation.
Use schema validation to enforce API contracts, document data models, and create self-validating configuration files. The validator highlights exactly which properties fail validation and provides clear error messages for quick debugging.