issue in getcartcontent - Object's Key/Value

[cheema14]

When I call cart's getcontent method it returns a json response to me. which is okay.
But the problem is below:
{
"data": {
"1667847103": {
"id": 1667847103,
"name": "Second Service",
"price": 50,
"quantity": 1,
"attributes": {
"id": 2,
"booking_id": "2",
"service_from": "01:00",
"service_to": "01:10",
"booking_day": "Monday",
"item_type": "services",
"variant": null,
"extras": [],
"restorant_id": 30,
"image": "/uploads/service_items/e479b758-e38d-4fa3-b0c4-35571caa439a_thumbnail.jpg",
"friendly_price": "€50.00"
},
"conditions": []
},
"cart_items": {
"id": 1667851688,
"name": "new dimensions",
"price": 100,
"quantity": 1,
"attributes": {
"id": 7,
"booking_id": "34",
"service_from": "09:00",
"service_to": "09:30",
"booking_day": "Invalid Date",
"item_type": "services",
"variant": null,
"extras": [],
"restorant_id": 30,
"image": "/uploads/service_items/cbe92aff-586f-447a-a2cc-baa5f95c22c5_thumbnail.jpg",
"friendly_price": "€100.00"
},
"conditions": []
}
},
"total": 450,
"quantity": 6,
"status": true,
"errMsg": ""
}

There is a key which is actually id:1667847103 and then there is a key which I made "cart_items". As you know that in JS you cannot do anyObj.1667847103, so I added a key "cart_items" so that I would be able to do anyObj.cart_items.blah .blah

Whenever I add cart_items in the Cart's addRow method, it only adds the last item being added to the cart.
but when I Revert the code it works fine.

Can somebody help me with that real quick? I am stuck!