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Middleware and its implementation in Express Js
Middleware is a crucial concept in Express Js, a popular web application framework for Node.js. It allows you to execute code at different points in the request-response cycle.
Middleware functions can perform tasks such as logging, authentication, data parsing, etc. They are functions that have access to the request object (req), the response object (res), and the next middleware function in the application’s request-response cycle.
Implementation in Express Js
To implement middleware in Express Js, you simply use the app.use() method. This method takes one or more middleware functions as arguments. These functions can be built-in middleware, third-party middleware, or custom middleware that you create.
Here’s an example of a simple custom middleware that logs the request method and URL:
// Custom middleware function
const logRequest = (req, res, next) => {
console.log(`${req.method} ${req.url}`);
next();
};
// Implementing middleware in Express Js
app.use(logRequest);
In the above code snippet, the logRequest middleware function logs the request method and URL to the console. The next() function is called to pass control to the next middleware function in the stack.
You can also implement middleware for specific routes by passing the middleware function as the second argument to app.get(), app.post(), etc.
Middleware is a powerful feature of Express Js that allows you to modularize your code and improve the maintainability of your application. By using middleware, you can easily add functionality to your application without cluttering your route handlers.
Overall, middleware is an essential concept in Express Js that every developer should be familiar with. By understanding how to implement middleware in Express Js, you can create more robust and scalable web applications.
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