AVAILABLE FOR WEB, FLUTTER & QA PROJECTS
How to use this tool
1. Paste Raw JSON Payload
Paste any valid JSON data object or payload into the input editor.
2. Automatic Type Inference
The generator automatically detects strings, numbers, integers, booleans, arrays, and nested objects.
3. Configure Validation Rules
Choose whether all properties should be marked as required and select your preferred Draft specification.
4. Copy Generated JSON Schema
Copy the output JSON Schema to use with Ajv, Zod, OpenAPI, or backend API request validators.
Formula or logic used
JSON Schema Specification & Inference Logic
JSON Schema is a vocabulary defined by IETF for annotating and validating JSON documents, ensuring strict structural contract conformity.
`type`: Inferred as 'object', 'array', 'string', 'number', 'integer', 'boolean', or 'null'.`properties`: Key-value map describing child property types for object nodes.`items`: Schema definition governing items within an array structure.`required`: Array of property names that must be present in compliant JSON documents.String Format Inference: Detects ISO dates, email addresses, URIs, and UUIDs automatically.
Examples
Example 1: User Profile JSON Contract
Creates an API contract ready for validation libraries like Ajv or Zod.
Example 2: Nested E-Commerce Order Payload
Guarantees backend microservices receive valid data structures without runtime crashes.
Common use cases
REST API Request Validation
Validate incoming HTTP POST and PUT request bodies using Ajv in Express or Next.js API routes.
OpenAPI / Swagger Documentation
Generate schema models for Swagger and Postman documentation from real response payloads.
Microservice Contract Testing
Ensure distributed services adhere to agreed payload structures and prevent breaking schema changes.
Database JSON Column Validation
Enforce schema validation constraints on PostgreSQL JSONB columns.
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Frequently asked questions
What is a JSON Schema?
JSON Schema is a standard (IETF Draft) that provides a formal contract for JSON data. It defines the allowed structure, data types, required fields, and format constraints of JSON objects, allowing automated validation.
Which JSON Schema draft version does this generator produce?
This generator produces JSON Schema compliant with Draft-07, the most widely adopted standard across web frameworks, OpenAPI 3.0, and validation libraries like Ajv.
Can I use the generated schema with TypeScript or Zod?
Yes! You can use tools like `json-schema-to-ts` or `json-schema-to-zod` to automatically convert this JSON Schema into native TypeScript interfaces and Zod validation schemas.
How does the generator handle arrays of objects?
The generator inspects elements in the array to infer a unified item schema representing the common properties of objects inside the array.
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