swift JSON login REST with post and get response example

You can use URLSession if you don't like to import Alamofire in your Project to perform a simple task.

here are some method : GET, POST, DELETE METHODS and tutorial

GET METHOD

func makeGetCall() {  // Set up the URL request  let todoEndpoint: String = "https://jsonplaceholder.typicode.com/todos/1"  guard let url = URL(string: todoEndpoint) else {    print("Error: cannot create URL")    return  }  let urlRequest = URLRequest(url: url)  // set up the session  let config = URLSessionConfiguration.default  let session = URLSession(configuration: config)  // make the request  let task = session.dataTask(with: urlRequest) {    (data, response, error) in    // check for any errors    guard error == nil else {      print("error calling GET on /todos/1")      print(error!)      return    }    // make sure we got data    guard let responseData = data else {      print("Error: did not receive data")      return    }    // parse the result as JSON, since that's what the API provides    do {      guard let todo = try JSONSerialization.jsonObject(with: responseData, options: [])        as? [String: Any] else {          print("error trying to convert data to JSON")          return      }      // now we have the todo      // let's just print it to prove we can access it      print("The todo is: " + todo.description)      // the todo object is a dictionary      // so we just access the title using the "title" key      // so check for a title and print it if we have one      guard let todoTitle = todo["title"] as? String else {        print("Could not get todo title from JSON")        return      }      print("The title is: " + todoTitle)    } catch  {      print("error trying to convert data to JSON")      return    }  }  task.resume()}

POST METHOD

func makePostCall() {  let todosEndpoint: String = "https://jsonplaceholder.typicode.com/todos"  guard let todosURL = URL(string: todosEndpoint) else {    print("Error: cannot create URL")    return  }  var todosUrlRequest = URLRequest(url: todosURL)  todosUrlRequest.httpMethod = "POST"  let newTodo: [String: Any] = ["title": "My First todo", "completed": false, "userId": 1]  let jsonTodo: Data  do {    jsonTodo = try JSONSerialization.data(withJSONObject: newTodo, options: [])    todosUrlRequest.httpBody = jsonTodo  } catch {    print("Error: cannot create JSON from todo")    return  }  let session = URLSession.shared  let task = session.dataTask(with: todosUrlRequest) {    (data, response, error) in    guard error == nil else {      print("error calling POST on /todos/1")      print(error!)      return    }    guard let responseData = data else {      print("Error: did not receive data")      return    }    // parse the result as JSON, since that's what the API provides    do {      guard let receivedTodo = try JSONSerialization.jsonObject(with: responseData,        options: []) as? [String: Any] else {          print("Could not get JSON from responseData as dictionary")          return      }      print("The todo is: " + receivedTodo.description)      guard let todoID = receivedTodo["id"] as? Int else {        print("Could not get todoID as int from JSON")        return      }      print("The ID is: \(todoID)")    } catch  {      print("error parsing response from POST on /todos")      return    }  }  task.resume()}

DELETE METHOD

func makeDeleteCall() {  let firstTodoEndpoint: String = "https://jsonplaceholder.typicode.com/todos/1"  var firstTodoUrlRequest = URLRequest(url: URL(string: firstTodoEndpoint)!)  firstTodoUrlRequest.httpMethod = "DELETE"  let session = URLSession.shared  let task = session.dataTask(with: firstTodoUrlRequest) {    (data, response, error) in    guard let _ = data else {      print("error calling DELETE on /todos/1")      return    }    print("DELETE ok")  }  task.resume()}

Thanks @MAhipal Singh for you answer. I'll post here example with Alamafire that I used so it's all in one stack question. It's easier than I though, solutions I tried to use before were not working cause I had problems with pinning certificate about I forgot..

func loginRest(login:String, password:String, deviceId:String){    let urlStr = restServices.REST_MAIN_URL + restServices.REST_LOGIN    let params = ["login":login, "password":password, "deviceId":deviceId]    let paramsJson = try! JSONSerialization.data(withJSONObject: params)    var headers: HTTPHeaders = ["Content-Type": "application/json"]  Alamofire.request(urlStr, method: .post, parameters: params, encoding: JSONEncoding.default, headers: headers).responseJSON { (response) in        switch response.result {        case .success:            print("SUKCES with \(response)")        case .failure(let error):            print("ERROR with '\(error)")        }      }

If the post is proper the response is (console print):

SUKCES with SUCCESS: {    firstLogin = 1;    token = "dfkafjkfdsakfadsjfksjkfaadjfkjdfkjfskjfdkafjakfjakfjsafksjdafjy878328hjh";}