var obj = [
{“name”: “Afghanistan”, “code”: “AF”},
{“name”: “Åland Islands”, “code”: “AX”},
{“name”: “Albania”, “code”: “AL”},
{“name”: “Algeria”, “code”: “DZ”}
];

// the code you're looking for
var needle = 'AL';

// iterate over each element in the array
for (var i = 0; i < obj.length; i++){
  // look for the entry with a matching `code` value
  if (obj[i].code == needle){
     // we found it
    // obj[i].name is the matched result
  }
}