{
  "title": "Checkbox",
  "description": "A super simple checkbox",
  "type": "object",
  "properties": {
    "done": {
      "type": "boolean",
      "title": "Approved",
      "default": false
    },
    "delivery_date": {
      "type": "string",
      "format": "date",
      "title": "Preferred Delivery Date",
      "validationErrorMessage": "Date must be today's date or later"
    }
  }
}