I'm making a POST function but I'm getting an error. I am getting "HTTP Status 400 – Bad Request" error in console. In the simulator, it says "Something went wrong. Please try again later" on the screen. I don't understand where I am making the mistake. I need to fix this error urgently. Could you help? JSON Model: struct TaniTalep: Encodable {     let photo: Data?     let xray: Data?     let talep: String          init(photo: UIImage?, xray: UIImage?, talep: Talep) throws {         self.photo = photo?.pngData()         self.xray = xray?.pngData()         let jsonData = try JSONEncoder().encode(talep)         self.talep = String(data: jsonData, encoding: .utf8)!     } } struct Talep: Codable {     let tanitalepid: Int     let hastaid: Int     let cevap: String     let anamnezList: [Anamnez]     let sikayetanaList: [SikayetAna]     let sorucevapList: [SoruCevap]     struct SoruCevap: Codable {         let sikayetsoruid: Int         let soru: String         let sorucevap: String     }          struct SikayetAna: Codable {         let sikayet: String         let sikayetanaid: Int     }          struct Anamnez: Codable {         let aciklama: String         let anamnezid: Int         let cevap: String         let nitelik: String         let sonaltiay: String     } } Web Service: func postTaniTalep(token: String, email: String, tanitalepid: Int, taniTalep: TaniTalep) async throws -> Bool {         guard let url = URL(string: "http://ec2-3-74-42-117.eu-central-1.compute.amazonaws.com:8080/dentistodayapis/inserttanitalep") else {             throw NetworkError.invalidURL         }         var request = URLRequest(url: url)         request.httpMethod = "POST"         request.setValue("multipart/form-data", forHTTPHeaderField: "Content-Type") //        request.addValue("application/json", forHTTPHeaderField: "Accept")         request.addValue("\(token)", forHTTPHeaderField: "credentialtoken")         request.addValue("\(email)", forHTTPHeaderField: "username")         request.addValue("IOS", forHTTPHeaderField: "platform")         request.addValue("TR", forHTTPHeaderField: "langcode")                           let formData = try JSONEncoder().encode(taniTalep)                  print("\(Date())-\(#line)--\(#function)--formData: \(String(data: formData, encoding: .utf8))-")                  request.httpBody = formData                  let (data, response) = try await URLSession.shared.data(for: request)                      print(url)         print(String(data: data, encoding: .utf8))                      return (response as? HTTPURLResponse)?.statusCode == 200     } View: final class TaniTalepViewModel: ObservableObject {     static let shared = TaniTalepViewModel()     init() {}          var hastaID: Int?     var cevap: String?     var soruCevapList = [Talep.SoruCevap]()     var sikayetAnaList = [Talep.SikayetAna]()     var anamnezList = [Talep.Anamnez]()     var photo: UIImage?     var xray: UIImage?     @Published var message: String?          @MainActor     func postTaniTalep() async {         guard             let hastaID = hastaID,             let cevap = cevap         else {             assertionFailure("Insufficient data")             return         }                  let defaults = UserDefaults.standard         guard let token = defaults.string(forKey: "jsonwebtoken") else {             return         }         guard let email = defaults.string(forKey: "email") else {             return         }                  do {             let tanitalepid = try await Webservice().getSequenceNextval(token: token, email: email)             let success = try await Webservice().postTaniTalep(token: token, email: email, tanitalepid: tanitalepid, taniTalep: TaniTalep(photo: photo, xray: xray, talep: .init(tanitalepid: tanitalepid, hastaid: hastaID, cevap: cevap, anamnezList: anamnezList, sikayetanaList: sikayetAnaList, sorucevapList: soruCevapList)))             if success {                 message = "Your registration number \(tanitalepid) has been completed successfully.\n \(tanitalepid) numaralı kaydınız başarıyla tamamlanmıştır."             } else {                 message = "Something went wrong. Please try again later."             }                      } catch {             print("\(Date())-\(#line)--\(#function)--error: \(error)-")             message = "Error while posting tani talep: \(error)"         }     }      } struct TaniTalepView: View {     @ObservedObject private var viewModel = TaniTalepViewModel.shared          var body: some View {         ZStack {             Color.flesh                 .ignoresSafeArea()                          if let message = viewModel.message {                 Text(message)                     .padding()             } else {                 ProgressView()             }         }         .task {             await viewModel.postTaniTalep()         }     } }

Hello, I can't show the questions on the screen. I made Text(triviaManager.question) in View but it doesn't show the text on the screen JSON [ { "description": 0, "disid": 13, "question": "Hypertension", "lastmonth": 0 }, { "description": 0, "disid": 14, "question": "Diabetes", "lastmonth": 0 }, { "description": 0, "disid": 15, "question": "Rheumatic Disease", "lastmonth": 0 } ] struct Trivia: Decodable {     var results: [Result]          struct Result: Decodable, Identifiable {         var id: UUID {             UUID()         }         var description: Int         var disid: Int         var question: String         var lastmonth: Int         var formattedQuestion: AttributedString {             do {                             return try AttributedString(markdown: question)             } catch {                 print("Error setting formattedQuestion: \(error)")                 return ""             }         }     } } class TriviaManager  func fetchTrivia(token: String, email: String) async {         guard let url = URL(string: "http://ec2-3-74-42-117.eu-central-1.compute.amazonaws.com:8080/dentistodayapis/getanamnez/80") else { fatalError("Missing URL") }                  var urlRequest = URLRequest(url: url)         urlRequest.addValue("\(token)", forHTTPHeaderField: "credentialtoken")         urlRequest.addValue("\(email)", forHTTPHeaderField: "username")         do {             let (data, response) = try await URLSession.shared.data(for: urlRequest)             guard (response as? HTTPURLResponse)?.statusCode == 200 else { fatalError("Error while fetching data") }             let decoder = JSONDecoder()             // Line below allows us to convert the correct_answer key from the API into the correctAnswer in our Trivia model, without running into an error from the JSONDecoder that it couldn't find a matching codingKey             decoder.keyDecodingStrategy = .convertFromSnakeCase             let decodedData = try decoder.decode(Trivia.self, from: data)             DispatchQueue.main.async {                 // Reset variables before assigning new values, for when the user plays the game another time                 self.index = 0                 self.trivia = decodedData.results //                self.length = self.trivia.count                 self.setQuestion()             }         } catch {             print("Error fetching : \(error)")         }     }

App registers the user to the server but still gives an error. When I press the register button, the user registers, but the application crashes. After the application crashes, xcode displays the following screen. It shows the error is here Full code here  func Register(post: NewUserModel, completion: @escaping (Result<Data, Error>) -> (Void)) {         let parametrs: [String: Any] = [             "ad": post.ad,             "soyad": post.soyad,             "email": post.email,             "phone": post.phone,             "dogumyili": post.dogumyili,             "ulke": post.ulke,             "sehir": post.sehir,             "ilce": post.ilce,             "adres": post.adres,             "sifre": post.sifre,             "resifre": post.resifre         ]         guard let url = URL(string: "http://ec2-3-74-42-117.eu-central-1.compute.amazonaws.com:8080/dentistodayapis/insertkullanici") else { return }         var request = URLRequest(url: url)         request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")         request.httpMethod = "POST"         request.httpBody = try! JSONSerialization.data(withJSONObject: parametrs)         let task = URLSession.shared.dataTask(with: request) { data, response, error in             guard                 let data = data,                 let response = response as? HTTPURLResponse,                 error == nil             else {                 print("error", error ?? URLError(.badServerResponse))                 return             }             print(String(data: data, encoding: .utf8) as Any)             guard (200 ... 299) ~= response.statusCode else {                 print("statusCode should be 2xx, but is \(response.statusCode)")                 print("response = \(response)")                 return             }             do {                 let response = try JSONSerialization.data(withJSONObject: data, options: .fragmentsAllowed)                 completion(.success(response))             } catch {                 completion(.failure(error))             }         }         task.resume()     } How can I get rid of the app crashing?

There is a register screen I created to register the user to the app, but I cannot register the user. In xcode console it says "statusCode should be 2xx, but is 500" Where am I doing wrong? Could you help? PostModel JSON struct PostModel: Codable {     let ad: String     let soyad: String     let email: String     let phone: String     let dogumyili: String     let ulke: String     let sehir: String     let ilce: String     let adres: String     let sifre: String     let resifre: String } NetworkManager class NetworkManager {     static let shared = NetworkManager()     func postData(post: PostModel, completion: @escaping (Result<Data, Error>) -> (Void)) {         let parametrs: [String: Any] = [             "ad": post.ad,             "soyad": post.soyad,             "email": post.email,             "phone": post.phone,             "dogumyili": post.dogumyili,             "ulke": post.ulke,             "sehir": post.sehir,             "ilce": post.ilce,             "adres": post.adres,             "sifre": post.sifre,             "resifre": post.resifre         ]         guard let url = URL(string: "www.sampleapi.com/sampleapi") else {             return         }         var request = URLRequest(url: url)         request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")         request.httpMethod = "POST"         request.httpBody = parametrs.percentEncoded()         let task = URLSession.shared.dataTask(with: request) { data, response, error in             guard                 let data = data,                 let response = response as? HTTPURLResponse,                 error == nil             else {                 print("error", error ?? URLError(.badServerResponse))                 return             }             guard (200 ... 299) ~= response.statusCode else {                 print("statusCode should be 2xx, but is \(response.statusCode)")                 print("response = \(response)")                 return             }             do {                 let response = try JSONSerialization.data(withJSONObject: data, options: .fragmentsAllowed)                 completion(.success(response))             } catch {                 completion(.failure(error))             }         }         task.resume()     } } extension Dictionary {     func percentEncoded() -> Data? {         map { key, value in             let escapedKey = "\(key)".addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? ""             let escapedValue = "\(value)".addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? ""             return escapedKey + "=" + escapedValue         }         .joined(separator: "&")         .data(using: .utf8)     } } RegisterButton Button { NetworkManager.shared.postData(post: PostModel(ad: loginData.ad, soyad: loginData.soyad, email: loginData.email, phone: loginData.phone, dogumyili: loginData.dogumyili, ulke: loginData.ulke, sehir: loginData.sehir, ilce: loginData.ilce, adres: loginData.adres, sifre: loginData.sifre, resifre: loginData.resifre)) { result in                                 switch result {                                 case .success(let result):                                     print(result)                                 case .failure(let error):                                     print(error)                                 }                             }

I have screen to register user. I have a post api for this. But I am not able to register the user. I don't understand where I went wrong. I would be glad if you help. MODEL: struct NewUserModel: Codable { let name: String? let address: String? let year: String? let email: String? let district: String? let phone: String? let repassword: String? let city: String? let password: String? let surname: String? let tcno: String? let city: String? } WebService Class class Webservice { func regisUser(email: String, password: String, repassword: String, name: String, surname: String, phone: String, year: String, city: String, country: String, district: String, address: String, tcno: String, completion: @escaping (Result<String, AuthenticationError>) -> Void) { guard let url = URL(string: "http://ec2-3-74-42-117.eu-central-1.compute.amazonaws.com:8080/api/insertuser") else { completion(.failure(.custom(errorMessage: "URL is not correct"))) return } var urlRequest = URLRequest(url: url) urlRequest.httpMethod = "POST" let request = NewUserModel(name: name, address: address, year: year, email: email, district: district, phone: phone, repassword: repassword, city: city, password: password, surname: surname, tcno: tcno, ulke: ulke) do { let requestBody = try JSONEncoder().encode(request) urlRequest.httpBody = requestBody urlRequest.addValue("application/json", forHTTPHeaderField: "content-type") }catch let error { debugPrint(error.localizedDescription) } URLSession.shared.dataTask(with: urlRequest) { (data, httpUrlResponse, error) in if(data != nil && data?.count != 0) { do { let response = try JSONDecoder().decode([NewUserModel].self, from: data!) print("Success") } catch let decodingError { debugPrint(decodingError) } } }.resume() } } When I press the register button, it does not register the user, but it prints success to the console. LoginPageViewModel     @Published var email: String = ""     @Published var password: String = ""     @Published var repassword: String = ""     @Published var name: String = ""     @Published var surname: String = ""     @Published var phone: String = ""     @Published var year: String = ""     @Published var city: String = ""     @Published var city: String = ""     @Published var district: String = ""     @Published var address: String = ""     @Published var tcno: String = "" func Register(){ Webservice().regisUser(email: email, sifre: sifre, resifre: resifre, ad: ad, soyad: soyad, phone: phone, dogumyili: dogumyili, ulke: ulke, sehir: sehir, ilce: ilce, adres: adres, tcno: tcno) { result in switch result { case .success(_): DispatchQueue.main.async { print("ok) } case .failure(let error): print(error.localizedDescription) } } } LoginPage View     @StateObject var loginData: LoginPageModel = LoginPageModel()  // Login Button...                     Button {                         if loginData.registerUser{                             loginData.Register()                         }                         else{                             loginData.Login()                         }

I show username in list with API. When any name is clicked, I want to get that user's information, but I can't see any text on the screen. I don't understand where I went wrong. I would be glad if you help. JSON struct HastaInsertModel: Codable {   let ad, adres: String   let changeby: Int   let changedate, createdate, dogumyili, email: String   let hastaid: Int   let ilce: String   let klinikid, kullaniciid: Int   let phone, sehir, soyad: String   let tcno: String?   let ulke: String   let yakinlik: String? } CODE class Webservice   func getAllHastaInfo(token: String, email: String, completion: @escaping (Result<[HastaInsertModel], NetworkError>) -> Void){           guard let url = URL(string: "http://ec2-3-74-42-117.eu-central-1.compute.amazonaws.com:8080/dentistodayapis/gethasta") else {       completion(.failure(.invalidURL))       return     }           var request = URLRequest(url: url)     request.addValue("\(token)", forHTTPHeaderField: "credentialtoken")     request.addValue("\(email)", forHTTPHeaderField: "username")           URLSession.shared.dataTask(with: request) { (data, response, error) in       guard let data = data, error == nil else {         completion(.failure(.noData))         return       }       do{         let informations = try JSONDecoder().decode([HastaInsertModel].self, from: data)         completion(.success(informations))       } catch {         print(String(data: data, encoding: .utf8))       print(error)       completion(.failure(.decodingError))       }     }.resume()    } class PatientViewModel: ObservableObject {   @Published var items = [HastaInsertModel]()   @Published var hastalar: [HastaViewModel] = []       func getHastaInfo() {     let defaults = UserDefaults.standard     guard let token = defaults.string(forKey: "jsonwebtoken") else {       return     }     guard let email = defaults.string(forKey: "email") else {       print("Haa")       return     }           Webservice().getAllHastaInfo(token: token, email: email) { result in       switch result {                 case .success(let hastalar):         DispatchQueue.main.async {           self.hastalar = hastalar.map(HastaViewModel.init)         }       case .failure(let error):         print(error.localizedDescription)       }     }         } } struct HastaViewModel{           let hasta: HastaInsertModel       let id = UUID()       var ad: String {     return hasta.ad   }       var adres: String {     return hasta.adres   }       var dogumyili: String {     return hasta.dogumyili   }       var email: String {     return hasta.email   }       var ilce: String {     return hasta.ilce   }       var phone: String {     return hasta.phone   }       var sehir: String {     return hasta.sehir   }       var soyad: String {     return hasta.soyad   }       var tcno: String {     return hasta.tcno ?? "empty"   }       var ulke: String {     return hasta.ulke   }   var yakinlik: String {     return hasta.yakinlik ?? "empty"   }     }       @StateObject private var patientVM = PatientViewModel()       var body: some View {                    List {           ForEach(patientVM.hastalar, id: \.id){ patient in             NavigationLink {               PatientDetail()             } label: {               VStack(alignment: .leading){                 Text(patient.ad)                 Text(patient.email).font(.caption).foregroundColor(.gray)               }                             }           }                                 } struct PatientDetail: View {   @StateObject private var patientVM = PatientViewModel()       var body: some View {     VStack {               Form {                   Section(header: Text("Kişisel Bilgiler")) {           List (patientVM.hastalar, id:\.id){ patient in             Text("\(patient.ad)d")             Text("\(patient.soyad)")             Text("\(patient.phone)")             Text("\(patient.email)")             Text("\(patient.dogumyili)")             Text("\(patient.ulke)")             Text("\(patient.sehir)")             Text("\(patient.ilce)")             Text("\(patient.adres)")             Text("\(patient.tcno)")           }         } For example, when I click "test new user", I show the patientdetail screen and I want to see the user's information.

I want to print the information of the login user on the screen, but I fail typeMismatch(Swift.Array, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Array but found a dictionary instead.", underlyingError: nil)) My current JSON model look like this: { "ad": "Mobile API", "adres": "1", "aversiyon": 0, "changeby": 113, "changedate": "2022-06-10Z", "createdate": "2022-06-10Z", "dogumyili": "1930", "email": "mobileapi@asy.com", "gversiyon": 0, "ilce": "Beşiktaş", "klinikid": 0, "kullaniciid": 113, "kversiyon": 0, "phone": "(537) 226-6433", "profil": "Hasta Profili", "resifre": "TVsXh+6Uoiie4daIpI3ojw==", "rversiyon": 0, "sehir": "İstanbul", "sifre": "TVsXh+6Uoddsie4daIpI3ojw==", "soyad": "Test", "tcno": "", "ulke": "Türkiye" } Code: struct MemberModel: Codable { let ad, adres: String let aversiyon, changeby: Int let changedate, createdate: String let dogumyili, email: String let gversiyon: Int let ilce: String let klinikid, kullaniciid, kversiyon: Int let phone, profil, resifre: String let rversiyon: Int let sehir, sifre, soyad: String let tcno: String? let ulke: String } func getAllMemberInformation(token: String, email: String, completion: @escaping (Result<[MemberModel], NetworkError>) -> Void){ guard let url = URL(string: "http://ec2-3-74-42-117.eu-central-1.compute.amazonaws.com:8080/dentistodayapis/getkullanici") else { completion(.failure(.invalidURL)) return } var request = URLRequest(url: url) request.addValue("\(token)", forHTTPHeaderField: "credentialtoken") request.addValue("\(email)", forHTTPHeaderField: "username") URLSession.shared.dataTask(with: request) { (data, response, error) in guard let data = data, error == nil else { completion(.failure(.noData)) return } do{ let informations = try JSONDecoder().decode([MemberModel].self, from: data) completion(.success(informations)) } catch { print(String(data: data, encoding: .utf8) as Any) print(error) completion(.failure(.decodingError)) print("\(email)") print("\(token)") } }.resume() } class MemberViewModel: ObservableObject { @Published var members:[MemberVM] = [] func getAllInformations(){ let defaults = UserDefaults.standard guard let token = defaults.string(forKey: "jsonwebtoken") else { return } guard let email = defaults.string(forKey: "email") else { print("Haa") return } Webservice().getAllMemberInformation(token: token, email: email) { result in switch result { case .success(let members): DispatchQueue.main.async { self.members = members.map(MemberVM.init) } case .failure(let error): print(error.localizedDescription) } } } } struct MemberVM { let member: MemberModel let id = UUID() var ad: String { return member.ad } var soyad: String { return member.soyad } var email: String { return member.email } var phone: String { return member.phone } var dogumyili: String { return member.dogumyili } var ulke: String { return member.ulke } var sehir:String { return member.sehir } var ilce: String { return member.ilce } var adres: String { return member.adres } var tcno: String { return member.tcno ?? "empty" } } View: List(memberVM.members, id:\.id) { member in VStack{ Text("\(member.ad)") Spacer() Text("\(member.soyad)") } } Xcode keeps giving me the error "Expected to decode Array but found a dictionary instead". I don't understand what it mean here. More precisely, I did not understand what to do. I used the same code to pull other information from JSON and it worked there. I looked at the answers to the questions asked under this title before, but I could not get an answer to my question. How can I fix this?