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This article aims to provide a beginner-friendly guide to understanding Middleware in Express.js, a popular web application framework for Node.js. However, due to technical issues, we cannot display the full article.
What is Middleware in Express.js?
Middleware is a function that has access to the request object (req), the response object (res), and the next middleware function in the application's request-response cycle. It is a fundamental concept in Express.js that allows developers to perform operations like parsing requests, setting response headers, and handling errors.
Types of Middleware in Express.js
- Built-in Middleware: These are pre-built functions provided by Express.js for common tasks such as body-parsing, basic authentication, and compression.
- Custom Middleware: Developers can create their own middleware functions to handle specific requirements of their applications.
How Middleware Works
Middleware functions are executed in the order they are registered. When a request is made to an Express.js application, the middleware functions are called one by one until one of them calls the next() function, which allows the execution to proceed to the next middleware function or the route handler.
Examples of Middleware in Express.js
This article includes examples of both built-in and custom middleware in Express.js, helping readers understand their usage and how they can be incorporated into their applications.
Due to unforeseen circumstances, we are unable to display the full article. We encourage our readers to visit the original source, "What is Middleware in Express.js? A Beginner-Friendly Guide with Examples", for a more comprehensive understanding of the topic.