JSFiddle - React, Tailwind, and code Playground

HTML

<select id="fillME"></select>
<button id="startFilling" value="">Start ajax</button>

JavaScript

$(function(){
var json = { 
   "0":  {"title":"localjsonOPtion1", "value":"b"},
   "1":  {"title":"localjsonOPtion2", "value":"a"}
};

$("#startFilling").click(function(){

        $.getJSON("http://localdev.myvouchercodes.co.uk/local/default/search/jsonresponse", function(data){
             $("#fillME").html("");
            for(key in data)
                $("#fillME").append("<option value='"+json [key].value+"'>"+json[key].title+"</option>");
            for(key in json)
                $("#fillME").append("<option value='"+json [key].value+"'>"+json[key].title+"</option>");
       });    
});
    });