HTTP Request and JSON parsing in Swift - json

Question

So, I'm trying to make a very simple watchOS app in XCode. It consists of a button, two labels and a separator between the two labels. It is a digital assistant app, and needs to interface with Dialogflow (https://dialogflow.com).
The button calls the presentTextInputController function, and I want to use that result as a query to my Dialogflow agent.
I need to make an HTTP request, which in JS would look more like this:
{
url:"https://api.api.ai/v1/query",
method:"post",
body:JSON.stringify({query:"userInput",lang:"en-US",sessionID:"yaydevdiner"}),
headers:{
contentType:"application/json; charset=utf-8",
Authorization:"Bearer <auth_token>"
}
}
The response is a JSON object, and I need to access the jsonObject["result"]["speech"] value as a String to use Label.setText()
Everything I've tried has given errors about type Any and other such things. I also haven't been able to do much debugging since the print output isn't showing up in XCode.
I must mention that I'm an extreme beginner to Swift, and I am not good at handling their types and casting and unpacking and things like that.
Could someone show me how I might handle this request and the subsequent processing of the JSON?
Here is my current code:
//HTTP Request
let parameters = [
"query":name![0] as? String,
"lang":"en-US",
"sessionID":"yaydevdiner"
];
//create the url with URL
let url = URL(string: "https://api.api.ai/v1/query")! //change the url
//create the session object
let session = URLSession.shared
//now create the URLRequest object using the url object
var request = URLRequest(url: url)
request.httpMethod = "POST" //set http method as POST
do {
request.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted) // pass dictionary to nsdata object and set it as request body
} catch let error {
print(error.localizedDescription)
}
request.addValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
request.addValue("Bearer f786fef55008491fb8422cea2be85eb1", forHTTPHeaderField: "Authorization")
//create dataTask using the session object to send data to the server
let task = session.dataTask(with: request as URLRequest, completionHandler: { data, response, error in
guard error == nil else {
return
}
guard let data = data else {
return
}
do {
//create json object from data
if let json = try JSONSerialization.jsonObject (with: data, options: .mutableContainers) as? [String:Any] {
self.Response.setText(json["result"]["string"]);
}
} catch let error {
print(error.localizedDescription)
}
})
task.resume()
}
Response is a text label.
This code gives me an error saying I should have a question mark between
json["result"] and ["speech"]. When I do this, it gives me another error saying "Type Any has no subscript members".

Answer 1

Ok, I figured it out.
Because XCode automatically makes an iOS app with the watchOS app, I decided to try debugging in the iOS app until I got the HTTP request and JSON parsing right.
Inside the JSONSerialization if statement, I had to add another if statement:
if let result = responseJSON["result"] as? [String:Any]{
self.Response.setText(result!["speech"] as? String ?? "Network error Occurred")
}
Thanks for the help from vadian!