JSON Schema Generator

Automatically generate JSON Schema from example JSON data for function calling and API validation.

Quick Templates

Strict Mode

Make all fields required and disable additional properties (recommended for function calling)

JSON Input

Generate a schema to see results

OpenAI Function Calling: Use the generated schema in the parameters field of your function definition.

Claude Tool Use: Include the schema in your tool's input_schema property.

API Validation: Use the schema to validate incoming/outgoing JSON data in your applications.