JSON Schema Validator
Validate JSON data against a JSON Schema specification
About this Tool
JSON Schema Validator is a free, privacy-first tool built for developers. Validate JSON data against a JSON Schema specification
All processing in your browser
Instant results, no delays
No signup, no limits
Upload or paste content
Saved locally for quick access
Disclaimer
This tool is provided for informational and educational purposes only. All processing happens entirely in your browser - no data is sent to our servers. While we strive for accuracy, please verify critical data before use in production environments. FormatKit is not responsible for any data loss, corruption, or issues resulting from tool usage.
How to Use JSON Schema Validator
Paste your JSON Schema on the left and your JSON data on the right. The validator will check if your data conforms to the schema specification in real-time, showing detailed error messages for any violations.
Features
- Real-time validation as you type
- Detailed error reporting with JSON paths and error descriptions
- Draft-07 and Draft-2019-09 JSON Schema support
- Format validation for email, uri, date-time, and more
- Share validation results via URL with encoded state
Common Use Cases
- API contract validation: Ensure API responses match defined schemas
- Configuration validation: Validate config files against expected structure
- Data quality checks: Verify data integrity before processing
- Schema development: Test JSON Schema specifications during development
FAQ
Q: What JSON Schema versions are supported?
The validator supports JSON Schema Draft-07 and Draft-2019-09, which are the most widely used versions. Most schemas will work without modification.
Q: Can I validate nested objects and arrays?
Yes! The validator fully supports nested structures, array validation, and complex schema patterns including allOf, anyOf, oneOf, and conditional schemas.
Q: How do format validators work?
Format validators (email, uri, date-time, etc.) are enabled by default. The validator will check that string values match the specified format patterns.