XMl -> JSON

XMLjson

XML -> NSDictionary

NSError *error = nil;
    NSString  *contents = [NSString stringWithContentsOfURL:[NSURL URLWithString:searchIncentivesURL]
                                                   encoding:NSUTF8StringEncoding
                                                      error:&error];
    NSData* xmlData = [contents dataUsingEncoding:NSUTF8StringEncoding];
    
    NSDictionary *xmlDictionary = [XMLReader dictionaryForXMLData:xmlData error:error];



NSDictionary -> JSON

NSError *error; 
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:xmlDictionary
                                                   options:NSJSONWritingPrettyPrinted // Pass 0 if you don't care about the readability of the generated string
                                                     error:&error];

if (! jsonData) {
    NSLog(@"Got an error: %@", error);
} else {
    NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
}