How to pass json string as parameter in swift - ios

Question

How to pass json as parameter string. I have tried by passing json as below but it throws error like AuthenticateUser: Invalid JSON primitive.
let jsonString = "{\"user\":\"usr\",\"password\":\"pass\"}"
var urlStr = "http://testserver/AuthenticateUser?data=\(jsonString)"
var url = NSURL(string: urlStr)
let request = NSMutableURLRequest(URL: url!)
request.URL = url
request.HTTPMethod = "POST"
request.addValue("application/xml", forHTTPHeaderField: "Content-Type")
request.addValue("application/xml", forHTTPHeaderField: "Accept")
let task = NSURLSession.sharedSession().dataTaskWithRequest(request)
{
(data, response, error) in
var error: NSError?
if data != nil {
var reply = NSString(data: data!, encoding: NSUTF8StringEncoding)
println("reply >> \(reply)")
}
}
task.resume()

Answer 1

Add this line after request initializtion:
request.HTTPBody = NSJSONSerialization.dataWithJSONObject(jsonString, options: nil, error: &err)
Update these lines for json format:
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
Reference:
POST with swift and API
http://jamesonquave.com/blog/making-a-post-request-in-swift/

Answer 2

I brought you answer up to passing json parameter as a string to URL.
var jsonString = "{\"user\":\"usr\",\"password\":\"pass\"}"
if let data = jsonString.dataUsingEncoding(NSUTF8StringEncoding)
{
var error: NSError?
var json = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.allZeros, error: &error) as? NSDictionary
if error != nil
{
println(error)
}
else
{
println(json)
}
var strUser = json?.valueForKey("user") as String
var strPassword = json?.valueForKey("password") as String
println(strUser)
println(strPassword)
var url = "http://testserver/AuthenticateUser?data="
var urlUserParameter = "user="
var urlPasswordParameter = "&password="
var appendString = "\(url)\(urlUserParameter)\(strUser)\(urlPasswordParameter)\(strPassword)"
//OR
var appendStringOne = url + urlUserParameter + strUser + urlPasswordParameter + strPassword
println(appendString)
println(appendStringOne)
}
Explanation
I converted JSON string to NSDictionary.
Then i get value using key
Finally i append all these string and now we have URL with parameters.