simple, unobtrusive authentication system for Node.js

 Passport is an authentication middleware for Node.js. Extremely flexible and
 modular, Passport can be unobtrusively dropped in to any Connect/Express-based
 web application.
 .
 It provides a comprehensive set of authentication systems: using a username
 and password, social networks credentials, OpenID, and more.
 .
 This package only provides the general framework and the "session"
 authorization strategy: other systems are packaged separately, please install
 the ones you need.
 .
 Node.js is an event-based server-side javascript engine.