What does this tool do?

It parses TypeScript interfaces with generateFunctionCallingSchema into JSON Schema parameters (properties, required, additionalProperties false) wrapped for openai, anthropic (input_schema), or gemini (functionDeclarations) targets.

How are descriptions, optionals, and unions handled?

JSDoc summaries and @param tags become descriptions, ? fields drop from required, pure literal unions become enum while mixed unions become anyOf, and OpenAI output sets strict true.

Is my interface uploaded or stored?

No. Type parsing and envelope building run entirely in your browser.

Why is schema null, or required missing a field?

Non-interface or empty inputs return schema null with an explanatory error, and optional ? properties are excluded from required by design.

AI Function Calling Schema Generator

Turn a TypeScript interface into OpenAI, Anthropic, or Gemini tools JSON entirely in your browser

Interface input

Target format

Supports JSDoc descriptions, @param tags, primitive and union types, arrays, and one-level nested objects.

About

Parse simplified TypeScript interfaces and object types into provider-specific function calling JSON. JSDoc descriptions, optional fields, unions, arrays, and one-level nested objects are supported locally with strict additionalProperties handling.

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