POST w/ JSON Body - Swift3 - fragments? - ios

Question

I'm simply trying to send a JSON string via a Swift3 httprequest.
Tried using a Dictionary, and an escaped string ...
func getToken(successHandler: #escaping (Any) -> Void, errorHandler: #escaping (Any) -> Void) {
var request = URLRequest(url: URL(string: "http://my-api.domain.com/getToken")!)
request.httpMethod = "POST"
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
do
{
// try with Dictionary
let bodyJson: [String: String] = [
"username": "theusername"
]
let bodyJsonData = try JSONSerialization.data(withJSONObject: bodyJson, options: [])
// try with escaped String
let jsonString = "{" +
"\"username\": \"theusername\"," +
"}"
let jsonStringData = jsonString.data(using: String.Encoding.utf8)
//request.httpBody = bodyJsonData
request.httpBody = jsonStringData
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard error == nil else {
print(error)
errorHandler(error)
return
}
guard let data = data else {
print("Data is empty")
errorHandler("Data is empty")
return
}
var json: Any? = nil
do
{
json = try JSONSerialization.jsonObject(with: data, options: [])
DispatchQueue.main.asyncAfter(deadline: .now()) {
successHandler(json)
}
}
catch let error as NSError {
errorHandler(error)
}
}
task.resume()
}
catch
{
errorHandler(error)
}
}
I keep getting:
Handle Error: 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.}
I can't find how to try allowing fragments, all of the examples/tutorials are for Swift2.x :/
Unsure what to do!

Answer 1

// prepare json data
let mapDict = [ "1":"First", "2":"Second"]
let json = [ "title":"ABC" , "dict": mapDict ] as [String : Any]
do {
let jsonData = try JSONSerialization.data(withJSONObject: json, options: .prettyPrinted)
// create post request
let endpoint: String = "https://yourAPI"
let session = URLSession.shared
let url = NSURL(string: endpoint)!
let request = NSMutableURLRequest(url: url as URL)
request.httpMethod = "POST"
// insert json data to the request
request.httpBody = jsonData
let task = session.dataTask(with: request as URLRequest){ data,response,error in
if error != nil{
print(error?.localizedDescription)
return
}
}
task.resume()
} catch {
print("bad things happened")
}