Generate JSON string from NSDictionary in iOS

NSError error; 

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictionaryOrArrayToOutput 

                                                   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];

}

NSError  err;

NSData * jsonData = [NSJSONSerialization dataWithJSONObject:myDictionary options:0 error:&err]; 

NSString  myString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];