+ (NSString *)dictionaryToJSONString:(NSDictionary *)dictionary 

{
    NSError *error = nil;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
    NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
//    NSString *jsonTemp = [jsonString stringByReplacingOccurrencesOfString:@"\n" withString:@""];
//    NSString *jsonResult = [jsonTemp stringByReplacingOccurrencesOfString:@" " withString:@""];
    return jsonString;
}


+ (NSString *)arrayToJSONString:(NSArray *)array

 {
    NSError *error = nil;
//    NSMutableArray *muArray = [NSMutableArray array];
//    for (NSString *userId in array) {
//        [muArray addObject:[NSString stringWithFormat:@"\"%@\"", userId]];
//    }
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:array options:NSJSONWritingPrettyPrinted error:&error];
    NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
//    NSString *jsonTemp = [jsonString stringByReplacingOccurrencesOfString:@"\n" withString:@""];
//    NSString *jsonResult = [jsonTemp stringByReplacingOccurrencesOfString:@" " withString:@""];
//    NSLog(@"json array is: %@", jsonResult);
    return jsonString;
}