JSON String to Object and vice-varsa

Object To JSON String: 

NSArray *values = [[NSArray alloc] initWithObjects : @"1", @"Test123", nil];

NSArray *keys = [[NSArray alloc] initWithObjects : @"id", @"name", nil];

NSDictionary *dict = [[NSDictionary alloc] initWithObjects : values forKeys : keys];

NSError *err;

NSData *data = [ NSJSONSerialization dataWithJSONObject : dict options:0 error :&err ];

    NSString *jsonString = [[NSString alloc] initWithData : data encoding : NSUTF8StringEncoding];

JSON String To Object:

//jsonString is the string that we want to parsed 

NSDictionary *responseDic = [NSJSONSerialization JSONObjectWithData:jsonString options:nil error:&error];