Create NSDictionary format as per JSON Request in POST method - swift

Question

I need to POST datas to JSON. I don't know how to convert to NSDictionary for some complicated JSON format.
Format is below:
//1.JSON FORMAT
{
"username": "qqq_qq#qqq.qq",
"password": "******"
}
//In Swift:
var params = ["username": nameTxtFld.text, "password" : passTxtFld.text] as Dictionary<String, String>
//WORKING
//2. JSON FROMAT
{
"name":"qqq",
"emailId":"qqq_qq#qqq.qq",
"user":{
"password":"****",
"confirmPassword":"****"
}
}
//In Swift
var parameters = ["userName": nameTxtFld.text, "email": emailTxtFld.text, "user" : ["password" : passTxtFld.text, "confirmPassword" : confPassTxtFld.text]] as Dictionary<String, String, String>
//Error
//Unprintable ASCII character found in source file
Kindly guide me? How to covert this format in NSDictionary

Answer 1

When you want to send a JSON format request to web server, why don't you create a String with the formatted keys and values like #"username=xxxx&password=xxx" and then while adding this string to NSMUtableURLRequest class, convert this string to NSData and then add it.
This will be format we can use while sending POST type of request.