object {success:true, distribution: object}

• distribution:object
  • customers:array[2]
    • 0:object
      • created:0000-00-00
      • customerID:45
      • etc...
    • 1:object
      • created:0000-00-00
      • customerID:45
      • etc...
  • users:array[1]
    • 0:object
      • created:0000-00-00
      • customerID:45
      • etc...

the above nested object, since its already an object you don't use JSON.parse or anything you simple find a way to loop through.  Simple un-nested object $.each() in jQuery will do the trick.  In this example I used a for loop for it.

       for(var i =0; i < data.distribution.customers.length; i++){                                         if(data.distribution.customers[i].field == 'to'){                     console.log(data.distribution.customers[i]);                 }         }