Express.js is a robust Node.js web application framework that provides a simple yet powerful API for building web and mobile applications. It offers various features and middleware that make it easy to handle HTTP requests, routing, and middleware functions.
Yii Framework is an open-source, high-performance PHP web application framework that provides a solid foundation for developing modern web applications. It uses the Model-View-Controller (MVC) architectural pattern and provides various features like authentication, authorization, caching, and database abstraction out of the box.