domainLookup.gs

function domainLookup(domain) {
  var result = "";
  if (domain == "") {
    return;
  }

  // Function to lookup available domains using rdap
  httpResult = UrlFetchApp.fetch("https://rdap.verisign.com/com/v1/domain/"+domain,{muteHttpExceptions: true});
 
  if (httpResult.getResponseCode() == 404) {
    return "Available";
  }
  else{
    return "Not Available"
  }
}