JSON Schema Generator
Generate JSON Schema from sample JSON data automatically with custom types, validation rules, and schema optimization for all major draft versions.
Schema Options
Sample JSON Data
Generated Schema
Your generated schema will appear here
Enter valid JSON data to get started
Intelligent Schema Generation
Auto-generation
Automatically generate schemas from sample JSON data with intelligent type inference.
Custom Options
Configure required fields, additional properties, constraints, and validation rules.
Draft Support
Support for JSON Schema Draft 07, 2019-09, and 2020-12 specifications.
Format Detection
Automatically detect string formats like email, URI, date, and UUID patterns.
Validation Rules
Generate comprehensive validation rules with min/max constraints and patterns.
Export & Download
Download generated schemas in JSON format with proper formatting and metadata.
JSON Schema Draft Versions
Draft 07
Draft 2019-09
Draft 2020-12
Perfect for Every Development Need
API Development
- Generate schemas for API request/response validation
- Create OpenAPI specification schemas quickly
- Validate incoming data against generated schemas
- Document API data structures comprehensively
Data Validation
- Validate configuration files and settings
- Ensure data consistency across systems
- Generate test data based on schema constraints
- Migrate and transform data with validation
Schema Generation Best Practices
Input Data Quality
Representative Samples
Use comprehensive sample data that covers all expected variations
Complete Structure
Include all possible properties and nested objects in samples
Valid JSON
Ensure input data is properly formatted and valid JSON
Schema Configuration
Required Fields
Carefully consider which fields should be marked as required
Additional Properties
Enable for flexible schemas, disable for strict validation
Constraints
Use min/max constraints judiciously based on actual requirements
Frequently Asked Questions
Which JSON Schema draft should I use?
Draft 07 is the most widely supported and stable choice for production use. Use Draft 2019-09 or 2020-12 if you need newer features and your tooling supports them.
How accurate are the generated schemas?
Generated schemas are based on the sample data provided. They're a great starting point but should be reviewed and refined based on your actual requirements and edge cases.
Can I modify the generated schema?
Absolutely! The generated schema is a starting point. You can copy it and modify as needed, adding custom validation rules, patterns, or constraints specific to your use case.
Does the tool validate the generated schema?
Yes, all generated schemas follow the JSON Schema specification for the selected draft version. They're syntactically correct and ready to use for validation.
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