How to combine array and object in json?

Question

JavaScript

At the moment there is an array cart, inside of which there are objects. The array needs to be converted to a json object, but after performing the operation, an object is created with a single key, in which the last element of the array is written

var cart = [];
var orderDetail1 = {
            dishId: 1,
            price: 200,
            quantyty: 1,
        }
var orderDetail2 = {
            dishId: 2,
            price: 150,
            quantyty: 4,
        }
var order = {
                    tableId: 1,
                    shiftId: 5,
                    finalPrice: 800
                }
cart.push(orderDetail1 );
cart.push(orderDetail2 );

At the output, I try to get a JSON object of the following form:

{
"order" : {
      "tableId" : 1 ,
      "shiftId" :  5,
      "finalPrice": 800
    },
"orderDetails" : [
    {
      "dishId" : 1,
      "price" : 200,
      "quantyty": 1
    },
    {
      "dishId" : 2,
      "price" : 150,
      "quantyty": 4
    },
  ]
}

I can't figure out how to combine an array and an object into one JSON

Answer 1

var json = JSON.stringify({
  order: order,
  orderDetails: cart
});