Вывод свойств объекта в js

var a = { 
  "products": [{ 
      "id": 1, 
      "name": "Товар1", 
      "price": 100, 
      "qty": 1 
    }, 
    { 
      "id": 2, 
      "name": "Товар2", 
      "price": 200, 
      "qty": 2 
    }, 
    { 
      "id": 3, 
      "name": "Товар3", 
      "price": 300, 
      "qty": 1 
    } 
  ], 
  "code": "0725422", 
  "costDelivery": 5 
}; 
 
var counter = 0; 
for (var key in a.products) { 
  counter++; 
} 
 
for (var key in a.products[0]) { 
  for (var i = 0; i < counter; i++) { 
    console.log("Ключ: " + key + ", значение: " + a.products[i][key]); 
  } 
}