How to parse Json and Normal Parmeters with URLSession swift 3 - ios

Question

I am passing parameters in parameters And Using below code.
this is ok for this parametere: module = mymoduleName and userId = userId
func callWebServices(url: String, methodName: String, parameters: String,istoken: Bool, tokenval: String, completion: #escaping CompletionHandler){
var url_param = url
if(methodName == "GET" && parameters != "")
{
url_param = url_param + "?" + parameters
}
var request = URLRequest(url: URL(string: url_param)!)
request.httpMethod = methodName
if(methodName == "POST" && parameters != "")
{
let postString = parameters
request.httpBody = postString.data(using: .utf8)
}
if(istoken)
{
request.setValue("Bearer " + tokenval , forHTTPHeaderField: "Authorization")
}
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
guard let data = data, error == nil else {
print("error=\(String(describing: error))")
return
}
if let httpsStatus = response as? HTTPURLResponse, httpsStatus.statusCode != 200 {
print("Status Code should be 200, but it is \(httpsStatus.statusCode)")
print("response = \(String(describing: response))")
}
do {
let dictData = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as! NSDictionary
completion(dictData)
} catch {
print("error is : \(error)")
}
}
task.resume()
}
But i have to parse parameters and json together like
module = mymoduleName
userId = userId and data = [{
"dmode_id": 1,
"user_id": 1,
"schedule_course_id": 1,
"course_id": 1}]
when i am calling this method getting error. help me to fix this issue. I am calling method like this.
callWebServices(url: URLS.Base_URL, methodName: "POST", parameters: param, istoken: false, tokenval: "", completion: { (jsonResult) in
print(jsonResult)
})