private func stringify(jsonData: Data) -> String {
        do {
            let array =  try JSONSerialization.jsonObject(with: jsonData, options: []) as? [String: Any]
            let jsonData2 = try JSONSerialization.data(withJSONObject: array,
                                                       options: .prettyPrinted)
            // here "jsonData" is the dictionary encoded in JSON data
            let jsonString = String(data: jsonData2, encoding: .utf8) ?? ""
            let result = String(jsonString.filter { !" \n\t\r".contains($0) })
            return result
        } catch {
        }
        return ""
    }