checkDomainLib.js

var requestURL = "https://dns.google/resolve?type=16";
var requestOptions = {
  method: 'GET',
  body: "",
  headers:{
    "accept": "application/dns-message",
    "Content-Type": "application/dns-json"
  }
};

function checkDomain(domain,dnsToken,httpClient) {
  var response = httpClient.send(requestURL + "&name="+ domain,requestOptions).get();
  if (response.status === 200) {
    var jsonObject = JSON.parse(response.text());
    var answerArray = jsonObject.Answer;
    var X = dnsToken;
    var isXPresent = answerArray.some(function(answer) {
    	return answer.data === X;
    });
    return isXPresent;
  } else {
    return false;
  }
}

exports.checkDomain = checkDomain;