JSON to NSDictionary

gistfile1.m

NSData *jsonData = [@"{}" dataUsingEncoding:NSUTF8StringEncoding];   // --> {};
NSDictionary *result = [NSJSONSerialization JSONObjectWithData:jsonData
                                                       options:NSJSONReadingAllowFragments
                                                         error:nil];

jsonData = [@"{\"a\":{}}" dataUsingEncoding:NSUTF8StringEncoding];  // --> { a = {}; }
result = [NSJSONSerialization JSONObjectWithData:jsonData
                                         options:NSJSONReadingAllowFragments
                                           error:nil];

jsonData = [@"{\"a\":false}" dataUsingEncoding:NSUTF8StringEncoding]; // --> { a = 0; }
result = [NSJSONSerialization JSONObjectWithData:jsonData
                                         options:NSJSONReadingAllowFragments
                                           error:nil];

{} is not falsey. We have to check result.count if we want to know whether the dictionary is empty or not.