delete null value from json

delete null value from json

I am working on JSON, now i have new issue create, when i'm delete an item
from JSON it will delete the all item on that index after this on that
place null are inserted now my problem is i want also index of that JSON
object
Demo Here
In this Fiddle these step follow (Please follow this step):
Add item in cart
Now click on Go to cart.
Now click delete button
A alert box generate, see the first index of JSON it will be show null, i
want delete that index from JSON