How to print the web service request and response from dataTaskWithRequest - ios

Question

Can anyone guide me how to print the web service request and response from dataTaskWithRequest in json format while using swift 4.0 and objective C.
Links tried:
How to print NSMutableURLRequest?
I can print them, but its not printing in proper format. I need in a format so that I can paste it in postman or web browser and test.
Request Format which I need:
eg:https://restcountries.eu/rest/v2/name/aruba?fullText=true
For Response:
Need the response format like the above url's response which I can view them in http://jsonviewer.stack.hu.

Answer 1

To get response objects in string and dictionary objects :
NSURLSessionDataTask *task = [session dataTaskWithRequest:URLRequest
completionHandler:
^(NSData *data, NSURLResponse *response, NSError *error)
{
// your code
NSString *responseString = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
id responseObjects = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
}
To get pretty printed json format from NSData object or dictionary :
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:yourDictionary
options:NSJSONWritingPrettyPrinted
error:&error];
NSString *strData = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
NSLog(#"Params : %#", strData);
EDIT
To print json Request, try using this :
// for POST/JSON type
NSLog(#"Request body %#", [[NSString alloc] initWithData:[request HTTPBody] encoding:NSUTF8StringEncoding]);
// for GET type
NSLog(#"Request url : %#", [[request.URL absoluteString] stringByRemovingPercentEncoding]);

Answer 2

Swift 4
Use this function to print your request.
Just pass your request to this function and remember that your request should be Dictionary.
func prettyPrintRequest(with json: [String : Any]) -> String{
let data = try! JSONSerialization.data(withJSONObject: json, options: .prettyPrinted)
let string = String(data: data, encoding: String.Encoding(rawValue: String.Encoding.utf8.rawValue))
if let string = string{
return string
}
print("something went wrong")
return ""
}
UPDATED to objective c code
-(void)prettyPrintRequest:(NSDictionary*)request{
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:request
options:NSJSONWritingPrettyPrinted
error:&error];
if (jsonData) {
NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
NSLog(#"Valid Json String is %#", jsonString);
} else {
NSLog(#"Error is : %#", error);
}
}

Answer 3

You can print JSON data like,
if error == nil {
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments)
print(json)
let dic = json as! NSDictionary
print(dic)
}
catch {
print("Throw error when convert to json")
}
}

Answer 4

For Printing the response in JSON format, so that you can copy/paste it into Postman and check.
In Objective C:
NSString* jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
NSLog(#"jsonString: %#", jsonString);
In Swift 4:
let dataString = String(data: data, encoding: String.Encoding(rawValue: String.Encoding.utf8.rawValue))!
print(dataString)