[
  {
    "cmd": "GetUser",
    "code": 0,
    "initial": {
      "User": {
        "level": "guest"
      }
    },
    "range": {
      "User": {
        "level": [
          "guest",
          "admin"
        ],
        "password": {
          "maxLen": 31,
          "minLen": 6
        },
        "userName": {
          "maxLen": 31,
          "minLen": 1
        }
      }
    },
    "value": {
      "User": [
        {
          "level": "admin",
          "userName": "admin"
        }
      ]
    }
  }
]