fastapi.json

{
  "openapi": "3.1.0",
  "info": {
    "title": "FastAPI",
    "version": "0.1.0"
  },
  "paths": {
    "/hello": {
      "get": {
        "summary": "Hello",
        "operationId": "hello_hello_get",
        "responses": {
          "200": {
            "description": "Successful Response",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/Message"
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "Message": {
        "properties": {
          "message": {
            "type": "string",
            "title": "Message"
          },
          "details": {
            "anyOf": [
              {
                "items": {
                  "$ref": "#/components/schemas/Message"
                },
                "type": "array"
              }
            ],
            "title": "Details"
          }
        },
        "type": "object",
        "required": [
          "message"
        ],
        "title": "Message"
      }
    }
  }
}