Question

I have a JSON object like the following:

{"Data": {
     "290": {
             ...
            }
     "300": {
             ...
            }
     "281": {
             ...
            }
         }
 }

How would I sort this JSON based on the top container keys (i.e. “290”, “300”, “281”)?

Edit: So I used

$.getJSON('current/csf.txt', function(data) { arr = data["Data"]; }

And it sorted them based on the key. Why did this happen?

Answer 1

You’ve tagged this “JavaScript” so I assume you mean “A JavaScript object generated from this JSON”.

In which case:

1. Loop over the property names (with a for in loop).
2. Use them to populate an array.
3. Sort the array.
4. Use the array as a map.

(You can’t store ordered data in an object).

If you want to store the results in JSON, then you will need to change your data structure (and use an array (of objects)). Objects are explicitly unordered.