{"UserData": {
              "Name": Mike Smith,
              "Age": 32,
              "category": [1,2,3],
              "Weekly Data": [
                               {"Monday" : [1.0,2.0,3.0]},
                               {"Tuesday": [1.0,2.0,3.0]}
                             ]
              }
}

-(NSString*)populateUserPreferences
{
    NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
    NSMutableArray *categorydata = [[NSMutableArray alloc] init];
    NSMutableArray *weeklydata = [[NSMutableArray alloc] init];

    for (int i=0;i<4; i++)
    {
        [categorydata addObject:[NSNumber numberWithInt:i]];
    }


        NSMutableArray *mondaydata = [[NSMutableArray alloc] init];
        for (int j=0; j<3; j++)
        {
            [mondaydata addObject:[NSNumber numberWithInt:j]];
        }

        NSMutableArray *tuesdaydata = [[NSMutableArray alloc] init];
        for (int j=0; j<3; j++)
        {
            [tuesdaydata addObject:[NSNumber numberWithInt:j]];
        }


      NSDictionary *monday  = [NSDictionary dictionaryWithObject:mondaydata];
      NSDictionary *tuesday = [NSDictionary dictionaryWithObject:tuesdaydata];

        [weeklydata addObject: monday  ];
        [weeklydata addObject: tuesday ];

    }

    [dict setObject:[NSString stringWithFormat:"Mike Smith"] forKey:@"Name"];
    [dict setObject:[NSNumber numberWithInteger:32.0] forKey:@"Age"];

    [dict setObject:categorydata forKey:@"category"];
    [dict setObject:weeklydata forKey:@"Weekly Data"];

    NSString * userdata = [dict JSONRepresentation];
    NSLog(request);

    NSDictionary *userdataJson = [NSDictionary dictionaryWithObject:dict forKey:@"userData"];

    return [userdataJson JSONRepresentation];
}