Parsing JSON without Object Mapping in Restkit iOS

Question

I\'ve created a login page which uses Restkit RKClient to send login details, and get back JSON data (either the user or an error). I want to be able to parse t

Answer 1

In iOS 5.1+ there's NSJSONSerialization.

Answer 2

Here is an example using RestKit 0.2 and NSJSONSerialization:

[[RKObjectManager sharedManager] getObjectsAtPath:kLoginURL
                                       parameters:params
                                          success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
                                              NSError *error;
                                              NSDictionary* json = [NSJSONSerialization JSONObjectWithData:operation.HTTPRequestOperation.responseData options:NSJSONReadingMutableLeaves error:&error];
                                              NSLog(@"msg: %@", [json objectForKey:@"msg"]);
                                          }
                                          failure:^(RKObjectRequestOperation *operation, NSError *error) {
                                          }];

Answer 3

You could use an open source library like JSONKit for that. It is able to parse a JSON response into a NSDictionary or NSArray.

Answer 4

You can simply call parsedBody:nil on your RKResponse object and assign the returned object to an NSDictionary:

responseDict = [response parsedBody:nil];

And as an extra check I use a little convenience method to check for a a successful response:

- (bool) wasRequestSuccessfulWithResponse:(RKResponse*)response {

    bool isSuccessfulResponse = NO; 

    id parsedResponse;

    NSDictionary *responseDict;

    if(response != nil) {

        parsedResponse = [response parsedBody:nil];

        if ([parsedResponse isKindOfClass:[NSDictionary class]]) {

            responseDict = [response parsedBody:nil];

            if([[responseDict objectForKey:@"success"] boolValue]) {

                isSuccessfulResponse = YES;
            }
        }

    } 

    return isSuccessfulResponse;

}