jQuery's getJSON not maintaining original order

What your Json SHOULD look like is

[{"id":"3", "name":"Andy"}, {"id":"1", "name":"Bruce"}, {"id":"4", "name":"Charlie"}, {"id":"2", "name":"David"}]

What you're sending is a series of objects (customers), so your data structure should ideally reflect that. And transferring it as an array you can keep the order, as has already been mentioned.