NSLookup.js

function NSLookup(type, domain) {
   
  if (typeof type == 'undefined') {
    throw new Error('Missing parameter 1 dns type');
  }
   
  if (typeof domain == 'undefined') {
    throw new Error('Missing parameter 2 domain name');
  }
  
  type = type.toUpperCase();
   
  var url = 'https://cloudflare-dns.com/dns-query?name=' + encodeURIComponent(domain) + '&type=' + encodeURIComponent(type);
  
  var options = {
    "muteHttpExceptions": true,
    "headers": {
      "accept": "application/dns-json"
    }
  };
  
  var result = UrlFetchApp.fetch(url, options);
  var rc = result.getResponseCode();
  var resultText = result.getContentText();
   
  if (rc !== 200) {
    throw new Error(rc);
  }
  
  var errors = [
    { "name": "NoError", "description": "No Error"}, // 0
    { "name": "FormErr", "description": "Format Error"}, // 1
    { "name": "ServFail", "description": "Server Failure"}, // 2
    { "name": "NXDomain", "description": "Non-Existent Domain"}, // 3
    { "name": "NotImp", "description": "Not Implemented"}, // 4
    { "name": "Refused", "description": "Query Refused"}, // 5
    { "name": "YXDomain", "description": "Name Exists when it should not"}, // 6
    { "name": "YXRRSet", "description": "RR Set Exists when it should not"}, // 7
    { "name": "NXRRSet", "description": "RR Set that should exist does not"}, // 8
    { "name": "NotAuth", "description": "Not Authorized"} // 9
  ];
  
  var response = JSON.parse(resultText);
   
  if (response.Status !== 0) {
    return errors[response.Status].name;
  }
   
  var outputData = [];
   
  for (var i in response.Answer) {
    outputData.push(response.Answer[i].data);
  }
   
  var outputString = outputData.join(',');
   
  return outputString;
   
}