Express.js is a web framework for Node.js, which is a popular platform for building server-side applications. While Node.js comes with a built-in set of modules for working with the server and the file system, Express.js provides a more robust and feature-rich set of tools for building web applications.

One of the key advantages of Express.js is its simple and easy-to-use routing system. This allows developers to define different routes for different types of requests. For example:

app.get('/', (req, res) => { // handle GET requests to the homepage });

app.post('/login', (req, res) => { // handle POST requests to the login page });

app.patch('/login', (req, res) => { // handle PATCH requests to the login page });

Another reason why Express.js is better than the built-in Node.js modules is that it provides a wide range of middleware options. Middleware functions are small pieces of code that can be used to modify the request and response objects in a Node.js application. This allows developers to easily add additional functionality to their web applications, such as authentication, validation, and logging. For example:

app.use(bodyParser.json()); // parse JSON request bodies

app.use(logger('dev')); // log requests to the console

In addition, Express.js has a large and active community of developers who contribute to the framework and provide support to users. This means that developers who use Express.js can benefit from a wealth of online resources, such as tutorials, documentation, and answers to common questions.

Overall, Express.js is a powerful and versatile web framework for Node.js that offers a number of advantages over the built-in Node.js modules. Its simple routing system, middleware options, and active community make it an excellent choice for building web applications.