NSArray *array = @[@"0", @"1", [NSNull null], @"2", [NSNull null], @"3"];
NSArray *compactArray = [array cu_compactArray];
//=> ["0", "1", "2", "3"]

NSDictionary *dictionary = @{@"one": @"1",
                             @"null": [NSNull null],
                             @"two": @"2",
                             @"three": @"3"};
NSDictionary *compactDictionary = [dictionary cu_compactDictionary];
 //=> {"one": "1", "two": "2", "three": "3"}

NSArray *array = @[@"0",
                   @"1",
                   [NSNull null],
                   @"2",
                   @{@"one": @"1",
                     @"null": [NSNull null],
                     @"two": @"2",
                     @"three": @"3"},
                   @"4"];
NSMutableArray *compactArray = [array cu_compactArray];
//=> ["0", "1", "2", {"one": "1", "two": "2", "three": "3"}, "4"]

id object = [NSJSONSerialization JSONObjectWithData:data options:opt error:error];
id result =  [object cu_compactJSONObject];

id result = [CUJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.responseSerializer = [CUJSONResponseSerializer serializer];

[manager GET:@"http://example.com/resources.json" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"JSON: %@", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@", error);
}];

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://example.com/resources.json"]];
CUJSONRequestOperation *operation = [CUJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
    NSLog(@"JSON: %@", JSON);
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
    NSLog(@"Error: %@", error);
}];
[operation start];

AFHTTPClient *client = [AFHTTPClient clientWithBaseURL:[NSURL URLWithString:@"http://example.com/"]];
[client registerHTTPOperationClass:[CUJSONRequestOperation class]];
[client setDefaultHeader:@"Accept" value:@"application/json"];

[client getPath:@"resouce.json" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"JSON: %@", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@", error);
}];