Serialize(); community static course StringExtensions community static string Serialize(this item dataToSerialize) if (dataToSerialize == null) return null; var options = new JsonSerializerOptions WriteIndented = accurate ; return JsonSerializer.Serialize(dataToSerialize, choices); If you have list of emails to be confirmed, it can be verified either by uploading list from client spac... https://colliniwtat.bloguetechno.com/5-Easy-Facts-About-email-verifier-api-Described-50172758