Serialize(); community static class StringExtensions public static string Serialize(this item dataToSerialize) if (dataToSerialize == null) return null; var alternatives = new JsonSerializerOptions WriteIndented = legitimate ; return JsonSerializer.Serialize(dataToSerialize, possibilities); When you have list of emails to be confirmed, it can be verified possibly by uploading listing ... https://emailverifierapi08417.bloguerosa.com/17261520/email-verifier-api-an-overview