Init Mapping

InitMapping.swift

struct User {
  let id: Int
  let name: String
  
  init?(dictionary: [String: Any]) {
    guard let id = dictionary["id"] as? Int else { return nil }
    guard let name = dictionary["user_name"] as? String else { return nil }
    
    self.id = id
    self.name = name
  }
}

do {
  if let userDictionary = try JSONSerialization.jsonObject(with: jsonData, options: []) as? [String: Any] {
    let user = User(dictionary: userDictionary)
    //Do something with user
  }
} catch {
  print(error)
}