Get the JSON response from swift api call

Question

I am bit new to swift programming with iOS. Can anyone help me to sort out the following problem. I am getting a JSON response as the following.

{
    "response": {
        "token": "d1fb8c33e401809691699fc3fa7dcb9b728dd50c7c4e7f34b909"
    },
    "messages": [
        {
            "code": "0",
            "message": "OK"
        }
    ]
}

I was trying several things to get the "token" out from this.

let data = json["response"] as! [[String : AnyObject]]

But none of these worked. Can anyone help me ? This is with swift 3

Answer 1

As response is a json object that has token so you need to cast response as dictionary then access token from it as below,

if let response = json["response"] as? [String : Any],
   let token = response["token"] as? String {
      print(token)
}

Avoid using force-unwrapping that can cause crashes.

---

Recommended way of parsing in Swift is using Codable. Here is the complete example,

// MARK: - Result
struct Result: Codable {
    let response: Response
    let messages: [Message]
}

// MARK: - Message
struct Message: Codable {
    let code, message: String
}

// MARK: - Response
struct Response: Codable {
    let token: String
}

do {
    let data = Data() // Change this to data from the API
    let result = try JSONDecoder().decode(Result.self, from: data)
    print(result.response.token)
} catch {
    print(error)
}