How do you know if an opened jar of applesauce is good?

To determine if an opened jar of Applesauce is still good, first check for any signs of spoilage, such as an off smell, discoloration, or visible mold. Additionally, if the Applesauce has a sour taste or unusual texture, it may be spoiled. Always check the expiration date and, if in doubt, it's safest to discard it. Proper storage in the refrigerator can help extend its freshness after opening.