Как подключить и изменять скачанный файл JSON?

// Replace "leverdemo" with your own company name
url = 'https://api.lever.co/v0/postings/leverdemo?group=team&mode=json'

//url = 'https://api.lever.co/v0/postings/leverdemo?group=team&mode=json'
//Checking for potential Lever source or origin parameters
var pageUrl = window.location.href;
var leverParameter = '';
var trackingPrefix = '?lever-'

if( pageUrl.indexOf(trackingPrefix) >= 0){
  // Found Lever parameter
  var pageUrlSplit = pageUrl.split(trackingPrefix);
  leverParameter = '?lever-'+pageUrlSplit[1];
}

//Functions for checking if the variable is unspecified
function cleanString(string) {
  if (string) {
    var cleanString = string.replace(/\s+/ig, "");
    return cleanString;
  }
  else {
    return "Uncategorized";
  }
}

function nullCheck(string) {
  if (!string) {
    var result = 'Uncategorized'
    return result;
  }
  else {
    return string;
  }
}

function createJobs(_data) {
  for(i = 0; i < _data.length; i++) {

    var team = nullCheck(_data[i].title)
    var teamCleanString = cleanString(team);
    $('#jobs-container .jobs-teams').append(
        '<a href="#" class="btn '+teamCleanString+'">'+team+'</a>'
      );
  }

  for(i = 0; i < _data.length; i++) {
    for (j = 0; j < _data[i].postings.length; j ++) {
      var posting = _data[i].postings[j]
      var title = posting.text
      var description = posting.description
      //Making each job description shorter than 250 characters
      var shortDescription = $.trim(description).substring(0, 250)
      .replace('\n', ' ') + "...";
      var location = nullCheck(posting.categories.location);
      var locationCleanString = cleanString(location);
      var commitment = nullCheck(posting.categories.commitment);
      var commitmentCleanString = cleanString(commitment);
      var team = nullCheck(posting.categories.team);
      var teamCleanString = cleanString(team);
      var link = posting.hostedUrl+leverParameter;

    	$('#jobs-container .jobs-list').append(
      '<div class="job '+teamCleanString+' '+locationCleanString+' '+commitmentCleanString+'">' +
        '<a class="job-title" href="'+link+'"">'+title+'</a>' +
        '<p class="tags"><span>'+team+'</span><span>'+location+'</span><span>'+commitment+'</span></p>' +
        '<p class="description">'+shortDescription+'</p>' +
        '<a class="btn" href="'+link+'">Learn more</a>' +
      '</div>'

      );
    }
  }
}

//Creating filter buttons for sorting your jobs
function activateButtons(_data){
  $('.jobs-teams').on("click", "a", function(e) {
    e.preventDefault();
    for(i = 0; i < _data.length; i++) {
      var teamRaw = _data[i].title;
      var team = cleanString(teamRaw);
      var jobs = $(".jobs-list");if ($(this).hasClass(team)) {
        if ($(this).hasClass("active")) {
          $(this).removeClass("active");
          jobs.find(".job").fadeIn("fast");
        }
        else {
          $(".jobs-teams").find("a").removeClass("active");
          $(this).addClass("active");
          jobs.find("."+team).fadeIn("fast");
          jobs.find(".job").not("."+team).fadeOut("fast");
        }
      }
    }
  })
}

//Fetching job postings from Lever's postings API
$.ajax({
  dataType: "json",
  url: url,
  success: function(data){
    createJobs(data);
    activateButtons(data);
  }
});