Express Routing and Performance Quiz

Node.js and Express

• Node.js is a platform for building server-side applications.
• Express is a fast, unopinionated, and minimalist web framework for Node.js.
• Express simplifies the process of building server-side applications with Node.js.

Routing

• Routing in Node.js refers to the process of determining how an application responds to a client request to a particular endpoint or URL.
• Express provides a sophisticated routing mechanism that allows managing different HTTP routes via a simple and intuitive API.
• Routing is used to handle every request, and every page must be handled in routing.

HTTP Module

• The http module is a core module in Node.js that allows creating HTTP servers and making HTTP requests.
• The http module is used to create a server using http.createServer().
• The listen() method is used to specify the port number on which the server will listen.

Request and Response Objects

• The req object represents the HTTP request.
• The res object represents the HTTP response.
• Middleware functions can access the req and res objects and the next middleware function in the application's request-response cycle.

Middleware

• Middleware functions are functions that have access to the req, res, and next middleware function in the application's request-response cycle.
• Middleware functions can perform tasks such as modifying the req and res objects, ending the request-response cycle, calling the next middleware function in the stack, etc.
• Middleware functions can be used to perform tasks such as logging, parsing request data, authentication, error handling, etc.

Creating a Server with Express

• To create a server with Express, you need to require the Express module, create an app object, and specify a port number.
• You can use the app.get() method to handle GET requests and the app.listen() method to start the server.