Json export for item set metadata?

Sorry if this is too basic. I’d like to be able to export the metadata of all items in an item set in order to do some additional enhancement outside of the system. Is there a basic query pattern with the API that would return the JSON for all items in a particular item set?

Sure: api/items?item_set_id=<X> where <X> is the ID of the item set you’re looking at.

Thanks so much! My syntax was slightly off, this will be very helpful.