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Day 2: More Express JS
Welcome to day 2 of our journey into learning Express JS! Today, we will be diving deeper into this popular web application framework for Node.js.
Creating Routes
One of the key features of Express is its routing capabilities. With Express, you can easily define different routes for handling different HTTP requests. For example, you can create a route for handling GET requests to the root URL:
app.get('/', (req, res) => {
res.send('Hello, world!');
});
In this example, we are creating a route that responds to GET requests to the root URL (‘/’). When a user visits this URL, they will see the text “Hello, world!” displayed on their screen.
Middleware
Middleware functions are functions that have access to the request object (req), the response object (res), and the next function in the application’s request-response cycle. They can perform any necessary tasks before passing control to the next middleware function.
Middleware functions can be used to perform tasks such as logging, authentication, error handling, and more. For example, you can create a middleware function that logs each request to the console:
app.use((req, res, next) => {
console.log(`${req.method} ${req.url}`);
next();
});
Conclusion
Today, we have explored more of the features of Express JS, including creating routes and using middleware functions. These are just a few of the many powerful tools that Express provides for building web applications.
Stay tuned for day 3, where we will continue our exploration of Express JS and learn even more about how to use this versatile framework for Node.js development!
