NSError *jsonError;
    NSLog(@"dictionary for json: %@",dict);

    NSData *jsonData = [NSJSONSerialization dataWithJSONObject: dict options: 0 error: &jsonError];
    if(jsonError != nil)
        NSLog(@"jsonError: %@",jsonError.localizedDescription);
    else
        NSLog(@"jsonError is nil");

    BOOL jsonBool = [NSJSONSerialization isValidJSONObject: jsonData];
    if(jsonBool == YES)
        NSLog(@"json: YES");
    else
        NSLog(@"json: NO");