Run addFish.js in node and use flags to add fishes. You need to add a name (-n), a price (-p), a description (-d) and a category (-c). For example:
node addFish.js -n "Hobbyfish" -p 30 -d "This fish has hobbies." -c "fish"
Run find.js in node. This will show all fishes. You can search for a single fish using its id (--id).
node find.js --id "63491e16b67d8434e6666ca7"