парсинг json

var changingData = [
{"id":1,"filename":2},
{"id":41,"filename":2},
{"id":66,"filename":2},
]
 
for (i in changingData) {
  YOUR_CODE_HERE()
  OPEN_FILE("https....." + changingData[i].filename + "postfix.txt")
  INSERT_TO_ELEMENT(changingData[i].id)
}

var changingData=[
    {"id":"sud_uch","filename":"2901110845_suduchastki"},
    {"id":"soc_usl","filename":"2901158036_reestr_post_sozuslug"},
];
 
for(var n in changingData){
var XHR = ("onload" in new XMLHttpRequest()) ? XMLHttpRequest : XDomainRequest;
var xhr = new XHR();
xhr.open('GET', 'https://opendata.dvinaland.ru/dataset/'+changingData[n].filename+'/meta.json', true);
xhr.onload = function() {
        var myObj = JSON.parse(this.responseText);   
        for (var i in myObj.data){
        document.getElementById(changingData[n].id).innerHTML = myObj.data[i].created; 
        }
       };
    xhr.send();
}

// ...
document.getElementById(changingData[n].id).innerHTML += myObj.data[i].created;
// ...