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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.

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 and function calling using a visual form. Outputs OpenAI and Anthropic tool format. Perfect for structured AI output definitions.

JSON Schema Builder is a free tool in the AI Tools category on BrowseryTools. It runs entirely in your browser — your data is never uploaded to a server, and there's no registration, no ads, and no watermarks, so your privacy is fully preserved.

Frequently asked questions