HTTP Post Requests Swift 5 with List of JSON objects - json

Question

Hello I am using Swift 5 to make an HTTP POST request, the request returns a list of JSON Objects which I believe is causing my error, and I can't seem to find a solution as I have scoured almost every example I could find on stackoverflow and youtube, and Apples documentation, even though this seems like a basic concept.
Here is what my response would look like:
[
{
"_id": "---------------",
"phone_number": "xxx-xxx-xxx"
"first_name": "Name",
"last_name": "LastName",
"gender": "Female",
"verified": true
},
{
"_id": "---------------",
"phone_number": "xxx-xxx-xxx"
"first_name": "Name",
"last_name": "LastName",
"gender": "Female",
"verified": true
}
]
The code I am using to make my HTTP Request is:
let url = URL(string: "URLString")!
let json: [String:Any] = ["phone_number":phoneNumber]
let session = URLSession.shared
var request = URLRequest(url: url)
request.httpMethod = "POST"
do{
request.httpBody = try JSONSerialization.data(withJSONObject: json, options: .prettyPrinted)
}catch let error {
print(error.localizedDescription)
}
//HTTP Headers
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
//URL data task
let task = session.dataTask(with: request) { (data, response, error) in
guard error == nil else{
print("Error!")
return
}
guard let data = data else{
print("Error fetching data")
return
}
do {
guard let responseJSON = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String:Any] else {
print("Unable to serialize response!") //FAILS HERE EVERY TIME
return
}
print(responseJSON)
print("WOO made it!")
}catch let error {
print("Error with response!")
}
}
task.resume()
I am not sure what the issue is exactly but I have indicated where it fails, and I have tried printing out the data before it converts it just to make sure it isn't empty and it says like 2000 bytes so I know its not empty. My guess is that there is a problem because it is in the format of a list of objects, rather than just one object as most of the examples have shown. I also am having some issues with my HTTP body being nil on my express server end sometimes, so Not sure if I am doing that part wrong. But as of Now I just want to be able to parse my response So I can begin debugging the rest. Thanks for any help.

Answer 1

You need [[String:Any]] instead of [String:Any]
guard let responseJSON = try JSONSerialization.jsonObject(with: data) as? [[String:Any]] else {
print("Unable to serialize response!") //FAILS HERE EVERY TIME
return
}
But it's better using JSONDecoder
do {
let res = try JSONdecoder().decode([Root].self,from:data)
}
catch {
print(error)
}
Correct json
[
{
"_id": "---------------",
"phone_number": "xxx-xxx-xxx",
"first_name": "Name",
"last_name": "LastName",
"gender": "Female",
"verified": true
},
{
"_id": "---------------",
"phone_number": "xxx-xxx-xxx",
"first_name": "Name",
"last_name": "LastName",
"gender": "Female",
"verified": true
}
]
struct Root: Codable {
let id, phoneNumber, firstName, lastName: String
let gender: String
let verified: Bool
enum CodingKeys: String, CodingKey {
case id = "_id"
case phoneNumber = "phone_number"
case firstName = "first_name"
case lastName = "last_name"
case gender, verified
}
}