If you are simply buying fruit juices at the store you are getting zero to virtually zero fiber. So you are getting a bunch of calories but without feeling any sense of fullness that you would get if you instead just ate the fruit.
Fruit is healthy but you are much better off just eating the fruit and drinking water. If you really want to drink the fruit juice you should just blend the fruit so that you are also getting all the pulp. The fiber is excellent for you and will help prevent you from turning all that juice into “empty” calories.