Passport.js

Passport is an authentication middleware designed specifically for Node.js applications. It functions as a modular component that can be integrated into any Express-based web application. The library offers over five hundred strategies to handle authentication through various mechanisms, including username and password credentials, as well as third-party providers such as Facebook, Twitter, Google, and OpenID. Its architecture allows developers to select and configure only the specific authentication methods required for their software systems without imposing a rigid application structure.