response.json

{
  "items": [
    {
      "id": "item-id-1",
      "type": "username",
      "placeholder": "Please enter your username",
      "required:": true,
      "minLength": 3,
      "maxLength": 15
    },
    {
      "id": "item-id-2",
      "type": "password",
      "required:": true,
      "placeholder": "Please enter your password",
      "minLength": 8,
      "maxLength": 64
    },
    {
      "id": "item-id-3",
      "type": "birthday",
      "required:": false,
      "placeholder": "Please enter your birthday",
      "minDate": "1900-01-01",
      "maxDate": "2020-01-01"
    },
    {
      "id": "item-id-4",
      "type": "gender",
      "required:": false,
      "placeholder": "Please enter your gender",
      "options": [
        "male",
        "female"
      ]
    }
  ]
}