Initializing Tool...
Paste any JSON object and instantly generate a valid JSON Schema or TypeScript interface.
The JSON Schema Generator instantly converts any valid JSON object into a complete JSON Schema (Draft 7) or TypeScript interface. It infers types for all primitives, nested objects, and arrays, lets you toggle required fields per property, and supports adding description annotations critical for LLM function-calling schemas.
Paste or type any JSON object into the left panel. The schema is generated in real time. Use the Field Annotations panel to mark individual fields as required or optional and add description text. Toggle between JSON Schema and TypeScript Interface output, then copy the result with one click.
AI function calling in GPT-4o, Claude Tool Use, and Gemini Function Calling all require precisely typed JSON Schemas. Building them by hand is error-prone and slow. This tool removes that friction entirely, producing production-ready schemas from example payloads in seconds.