A visual form that generates standard JSON Schema structures for LLM Function Calling (OpenAI, Anthropic, Google). Instead of hand-writing error-prone JSON, you fill in parameter names, types, descriptions, and required flags, then click Generate to get a perfectly formatted schema ready for copy-paste into your AI agent code.

Why Use This Schema Generator?

• No hand-writing JSON — fill a visual form and get the correct structure.
• Function Calling ready — output matches the OpenAI/GPT/Claude function calling spec.
• Dynamic parameters — add or remove parameters as needed.
• Type support — string, number, integer, boolean, array, and object types.

Key Features

• Function Name & Description: Define the function metadata at the top.
• Parameter Builder: Add rows with name, type, description, and a required checkbox.
• Proper Nesting: Output includes the standard type: "function" wrapper with parameters.properties.
• Required Array: Automatically builds the required array from checked fields.

How it Works

You define the function name and description, then add parameters with their types. Clicking “Generate” constructs a JSON object following the OpenAI Function Calling specification: { type: "function", function: { name, description, parameters: { type: "object", properties, required } } }. The output is pretty-printed with 2-space indentation.

Try the Schema Generator

Enter your function name and description, add parameters, then click “Generate Schema.” Copy the result directly into your AI agent code.