In some cases, when you download a JSON object from an API, some field is null or empty, and you check:
if ([JSON objectForKey:aKey]) ...
it returns a NSNull object instead nil, thus a non-null object which pass the "if" checking but it's really nothing, with this method you'll not have more NSNull shit anymore.
Also check NSArray+Verified!
Also check NSObject+NSVerifiedKeyValueCoding!