Parsing JSON Within JSON in Objective-C

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":"[email protected]",
                    "age":28,
                }
            "
        }
    ]

NSArray *topLevel = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil]; NSString *lowLevel = [[topLevel firstObject] objectForKey:@"data"]; NSData *lowLevelData = [lowLevel dataUsingEncoding:NSUTF8StringEncoding]; NSDictionary *final = [NSJSONSerialization JSONObjectWithData:lowLevelData options:0 error:nil]; or something like that could do the trick. — Larme
– Larme, Commented Oct 15, 2015 at 12:57

Larme · Accepted Answer · 2015-10-15 13:15:30Z

2

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];

answered Oct 15, 2015 at 13:15

Larme

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Comments

baydi · Accepted Answer · 2015-10-15 12:56:55Z

0

You should use this line of code

NSDictionary* responseDict = [NSJSONSerialization JSONObjectWithData: data options:kNilOptions error:&errorJson];

it will help.thanks

answered Oct 15, 2015 at 12:56

baydi

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1 Comment

Anbu.Karthik Over a year ago

@bayadi -- are you checked the URL is valid or not, check once and then submit your answer

SeanChense · Accepted Answer · 2016-07-23 06:17:25Z

0

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"]);
    }
}

edited Jul 23, 2016 at 6:17

SeanChense

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answered Jul 23, 2016 at 5:06

user2068161

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