Can I use couchbase node.js library not only to access couchbase bucket, but memcached buckets too? Is it possible at all, and if it’s possible are there any differences in configuration between couchbase and memcached bucket?
Yes you can, they are not difference from a client point of view.
However I usually prefer to use a Couchbase bucket all the time since it provides complete clustering feature (replication and rebalance), and because of the way we manage the persistence it has no impact on performance of your application.
You can find information about the different buckets types here: