JSON Schema Builder

Build JSON schemas for LLM tool calls. Outputs OpenAI and Anthropic tool formats. Runs on your device — nothing is uploaded, nothing is stored.

Tool / Function Name

Description

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Output Format

{
  "type": "function",
  "function": {
    "name": "function_name",
    "description": "",
    "parameters": {
      "type": "object",
      "properties": {}
    }
  }
}

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About JSON Schema Builder

Build JSON schemas for LLM tool calls. Outputs OpenAI and Anthropic tool formats.

JSON Schema Builder is a free tool in the AI Tools category on BrowseryTools. It runs entirely in your browser: what you give it is processed on your own device and is never uploaded to a server, there's no registration, no ads and no watermarks, and it keeps working with no connection once the page has loaded.