JSON Schema Generator
Automatically generate a JSON Schema from any JSON sample. Perfect for AI function calling, API validation, and TypeScript type generation.
About JSON Schema
Instantly derive a JSON Schema from any JSON object or array. Useful for OpenAI function calling, Anthropic tool use, and API contract validation.
Why generate JSON Schema?
JSON Schema is the standard for describing the structure of JSON data. It is required for AI function calling (OpenAI, Claude), API validation, form generation, and TypeScript type inference.
Key Features
- Auto Type Inference: Detects string, number, integer, boolean, object, and array types automatically.
- Format Detection: Identifies date-time, email, and URI string formats.
- Draft Support: Outputs Draft 2020-12, Draft 07, or Draft 04 schemas.
- Required Fields: Automatically marks non-null fields as required.
How to Use
- Paste a JSON sample into the left panel.
- Click Generate Schema to produce the JSON Schema.
- Copy the schema and use it in your API, AI tool definition, or validator.