//pretty printing JSON => JSON.stringify(obj, null, 2);
var product = {
  "productTypeCode": "productTypeEnergy",
  "quantities": [
    {
      "period": {
        "startDate": "2017-01-13T05:00:00.000Z",
        "endDate": "2017-01-31T05:00:00.000Z",
        "dayType": {
          "normal": true,
          "holiday": true
        },
        "specificDays": [
          "monday",
          "wednesday",
          "friday"
        ],
        "loadType": {
          "high": true,
          "medium": false,
          "low": false
        }
      },
      "type": "DemandPercentage",
      "quantityValue": "44"
    },
    {
      "period": {
        "startDate": "2017-01-13T05:00:00.000Z",
        "endDate": "2017-01-31T05:00:00.000Z",
        "dayType": {
          "normal": true,
          "holiday": true
        },
        "loadType": {
          "high": false,
          "medium": true,
          "low": false
        }
      },
      "type": "Value",
      "quantityValue": "22"
    }
  ]
};

var period = {
  "startDate": "2017-01-08T05:00:00.000Z",
  "endDate": "2017-01-29T05:00:00.000Z",
  "dayType": {
    "normal": true,
    "holiday": true
  },
  "loadType": {
    "high": true,
    "medium": false,
    "low": true
  }
};