{
  "swagger": "2.0",
  "info": {
    "title": "Circular reference examples",
    "version": "1.0"
  },
  "schemes": ["http"],
  "host": "httpbin.org",
  "paths": {
    "/post": {
      "post": {
        "parameters": [
          {
            "in": "body",
            "name": "body",
            "schema": {
              "$ref": "#/definitions/node"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Circular"
          }
        }
      }
    }
  },
  "definitions": {
    "node": {
      "type": "object",
      "properties": {
        "children": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/node"
          }
        }
      }
    }
  }
}