AF.request(urlStr, method: .get, parameters: nil, encoding: URLEncoding.default, headers: nil)

            .responseJSON(completionHandler: { response in

                switch response.result {

                case .success:

                    let resJSON = JSON(response.value)

                    ...

                case .failure(let error):

                    print(error)

                }

            })

pod 'Alamofire', '~> 5.2'