When developing a web application there is often a need to store password data in your database. For example, what if you have users and you don't want to use OpenID or similar for account management?
When storing password data, whether you think your servers are bulletproof or not, they should not be stored as plain text. The following video tutorial explains how to use Bcrypt to hash passwords before saving them into the database, offering your user accounts enhanced protection.
The above video has a write-up that I did earlier in the year. The article found here is a great comliment to what you saw above. For more information and examples on using the Node.js SDK with Couchbase, check out the developer portal.