JSON Schema Data Generator

Generate realistic demo data from JSON schemas with advanced customization options

Generating data...

JSON Schema Input

Enter your JSON Schema

Number of Records

Pretty Print JSON

Include Optional Fields

Strict Validation

Data Locale

Generated Data

Records

Fields

0 KB

Size

0ms

Time

Generated data will appear here...

About This Tool

The Advanced JSON Schema Data Generator is a powerful tool that creates realistic demo data based on JSON Schema specifications. It supports all standard JSON Schema types, formats, and constraints while providing extensive customization options.

Built with modern web technologies, this tool offers real-time validation, multiple output formats, and intelligent data generation algorithms to produce meaningful test data for your applications.

User Guide

Paste your JSON Schema in the input area
Adjust the number of records to generate
Configure generation options (locale, validation, etc.)
Click "Generate Data" to create demo data
Use "Copy JSON" or "Download JSON" to save results
Monitor generation statistics in real-time

Key Features

Smart Data Generation: Realistic data based on field names and formats
Schema Validation: Real-time validation with detailed error reporting
Multiple Formats: Support for all JSON Schema data types and formats
Constraint Support: Respects min/max, patterns, and enum values
Localization: Generate data in multiple languages and regions
Batch Generation: Create up to 1000 records at once

Use Cases

API Testing: Generate test data for REST API endpoints
Database Seeding: Populate development databases with sample data
UI Development: Create mock data for frontend components
Performance Testing: Generate large datasets for load testing
Documentation: Create examples for API documentation
Prototyping: Quickly mock data structures for new projects

Pro Tips

Use descriptive field names (e.g., firstName, email) for smarter data generation
Include format specifications for better data quality
Set appropriate minimum and maximum constraints
Use enum for predefined value lists
Enable strict validation for production-ready schemas
Test with different locales for internationalization

Schema Examples

User Profile Schema:

{
  "type": "object",
  "properties": {
    "id": {"type": "integer", "minimum": 1},
    "firstName": {"type": "string"},
    "lastName": {"type": "string"},
    "email": {"type": "string", "format": "email"},
    "age": {"type": "integer", "minimum": 18, "maximum": 99},
    "isActive": {"type": "boolean"},
    "role": {"type": "string", "enum": ["admin", "user", "guest"]}
  },
  "required": ["id", "firstName", "lastName", "email"]
}

Online Demo JSON Schema Data Generator Tool

JSON Schema Data Generator

JSON Schema Input