If instead you’re looking to run a node.js process outside the cluster to access Couchbase, have a look at the node.js SDK.
If neither of these apply to what you’re trying to do, it’d be great if you could describe what you’re looking for a bit further.
I am looking for stored procedures. if you can look at here,
If you’re comparing to Firebase or Realm and you are deploying to mobile devices, then you’ll probably want to have a look at Sync Gateway’s sync function and changes feeds.