Express.js is the most popular framework for Node.js, known for its performance and simplicity.
1The Middleware Pattern
Everything in Express is a middleware. Whether it's logging, parsing JSON, or handling routes, you're essentially building a pipeline where the request flows through various functions until a response is sent.
2Modular Routing
As applications grow, putting all routes in one file becomes unmanageable. Express provides the Router class to create modular, mountable route handlers that keep your code clean and organized.
3Performance
Because Express adds a very thin layer on top of Node.js, it's incredibly fast. It doesn't force you into a specific project structure, giving you the freedom to architect your app as you see fit.
