text: hello,
  I am green to swift 3. In order to transfer data between mysql server and ios, i try to connect my server and device by URLSession.Shared.dataTask.
  but the format changed form
  [{"id":"1","names":"abc","pws_1":"password","pws_2":"pw"}]
  to
  Optional(<__NSSingleObjectArrayI 0x6200000039e0>( { names = abc; id = 1; "pws_1" = password; "pws_2" = pw; } ) )
  how can i convert the json object?
  It’s hard to say for sure without seeing more of your code. Here’s a snippet of how you might send a basic JSON request to a server.
  import Foundation let json: [[String:String]] = [ [ "tick": "tock" ], [ "bim": "bam" ] ] let session = URLSession.shared let url = URL(string: "")! var request = URLRequest(url: url) request.setValue("application/json", forHTTPHeaderField: "Content-Type") request.httpBody = try! JSONSerialization.data(withJSONObject: json, options: []) let task = session.dataTask(with: request) { (responseBody, response, error) in // … check `error` then check `response` then process `responseBody` … } task.resume()
  You need to look at how your code sets the
  httpBody property. It seems like you’re serialising the in-memory objects to JSON data in some non-standard way.
  Share and Enjoy
  —
  Quinn “The Eskimo!”
  Apple Developer Relations, Developer Technical Support, Core OS/Hardware
  let myEmail = "eskimo" + "1" + "@apple.com"