JSFiddle - React, Tailwind, and code Playground

HTML

<select id="dvdtitle"></select>

JavaScript

// This is the data retrieved using Ajax.
var data = [{"503":"Caught In The Crossfire"},{"690":"Dead Man Running"},{"1064":"Get Rich Or Die Trying"},{"1145":"Gun"},{"1254":"Home of The Brave"},{"2184":"Righteous Kill"},{"2519":"Streets Of Blood"},{"3273":"Twelve"}];

// Loop through each object in the data array.
$.each(data, function(key, movie)
       {
           // Because the ID is a key and the title a value, we can't determine the ID/title unless we loop through each one of the key/value pairs in the object. Each movie only has one key/value pair so this won't be a problem.
           $.each(movie, function(id, title)
                  {
                      $('<option />').attr('value', id).text(title).appendTo('select#dvdtitle')
                  });
       });