Parsing JSON Within JSON in Objective-C - ios

Question

I'm trying to store the JSON that is within the JSON i get from the following request...
NSURL *URL = [NSURL URLWithString:#"http://www.demo.com/server/rest/login?username=admin&password=123"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
[request setHTTPMethod:#"GET"];
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *task = [session dataTaskWithRequest:request
completionHandler:
^(NSData *data, NSURLResponse *response, NSError *error) {
if (error) {
// Handle error...
return;
}
if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
NSLog(#"Response HTTP Status code: %ld\n", (long)[(NSHTTPURLResponse *)response statusCode]);
NSLog(#"Response HTTP Headers:\n%#\n", [(NSHTTPURLResponse *)response allHeaderFields]);
}
NSString* body = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(#"Response Body:\n%#\n", body);
}];
[task resume];
The resulting JSON obtain from body is the following and as you can see there is a JSON within the JSON, how can I store that JSON in a NSDictionary as you can see that JSON is between quotation marks.
[
{
tag: "login",
status: true,
data:
"
{
"userID":1,
"name":"John",
"lastName":"Titor",
"username":"jtitor01",
"userEmail":"jtitor01#gmail.com",
"age":28,
}
"
}
]

Answer 1

What you have in reality:
Classic JSON, where inside there is a String "representing" a JSON.
So, since we can do:
NSData <=> NSString
NSArray/NSDictionary <=> JSON NSData
We just have to switch between them according to the kind of data we have.
NSArray *topLevelJSON = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSString *lowLevelString = [[topLevelJSON firstObject] objectForKey:#"data"];
NSData *lowLevelData = [lowLevelString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *final = [NSJSONSerialization JSONObjectWithData:lowLevelData options:0 error:nil];

Answer 2

You should use this line of code
NSDictionary* responseDict = [NSJSONSerialization JSONObjectWithData: data options:kNilOptions error:&errorJson];
it will help.thanks

Answer 3

Try this
- (void)loadDetails {
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
[[session dataTaskWithRequest:request
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
_allVehicleLocationsArray = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
[self afterCompleteDoThis];
}] resume];
}
- (void)afterCompleteDoThis {
for (NSDictionary *vehicleDict in _allVehicleLocationsArray) {
NSLog(#" PPP %#" , [vehicleDict valueForKey:#"vehicleType"]);
}
}