Swift JSON parsing username and password - ios

Question

I am trying to POST username & password as NSDictionary through JSON format. I am getting this following error :
Domain=NSCocoaErrorDomain Code=3840 "
JSON text did not start with array or object and option to allow fragments not set."
UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}
My code is below:
#IBAction func loginAuthentication(_ sender: UIButton) {
let username : NSString = NameTextField.text! as NSString
let password : NSString = passwordTextField.text! as NSString
let parameters = [
"username": "\(username)",
"password": "\(password)"
]
print(parameters)
let headers = [
"content-type": "application/json",
"cache-control": "no-cache",
"postman-token": "121b2f04-d2a4-72b7-a93f-98e3383f9fa0"
]
if let postData = (try? JSONSerialization.data(withJSONObject: parameters, options: [])) {
let request = NSMutableURLRequest(url: URL(string: "http://..")!,
cachePolicy: .useProtocolCachePolicy,
timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData
print(request.httpBody)
// let session = URLSession.shared
let task = URLSession.shared.dataTask(with: request as URLRequest) {
(data, response, error) -> Void in
if (error != nil) {
print("Error message \(error)")
} else {
DispatchQueue.main.async(execute: {
if let json = (try? JSONSerialization.jsonObject(with: data!, options: [])) as? NSDictionary
{
let success = json["error"] as? Bool
print("Error from php\(success)")
let message = json["message"] as? String
// here you check your success code.
if (success == false)
{
print("Result1 \(message)")
self.performSegue(withIdentifier: "", sender: self)
}
else
{
self.dismiss(animated: true, completion: nil)
print("Result2 \(message)")
}
}
})
}
}
task.resume()
}
}

Answer 1

The problem looks to me like your string is not being serialized correctly. Instead of your current json serialization approach, simply convert a swift dictionary to data.
//Start with a dictionary
let body = [
"username": "bob",
"password": "admin"
]
//Serialize it.... you might want to put this in a do try catch block instead
let jsonBody = try? JSONSerialization.data(withJSONObject: body, options: .prettyPrinted)
//Add it to the request
request.httpBody = jsonBody
//make the request, etc.
let task = URLSession.shared.dataTask(with: request as URLRequest){ data,response, error in