Types of Middleware in Node.js

In this module, we will explore the different types of middleware that can be used in a Node.js application. Each type of middleware has its specific use and purpose. Understanding these types is crucial for properly organizing and structuring your application.

Route Middleware

Route middleware is applied to specific routes in the application. It is used to perform specific tasks before the request reaches the route handler.

Example

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Application Middleware

Application middleware is executed every time the application receives a request. They are globally applied and are useful for tasks that need to be performed on every request, such as connecting to a database or setting headers.

Example

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Error Handling Middleware

These middleware are used to capture and manage errors in the application. They must be declared at the end of all other routes and middleware.

Example

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Built-in Middleware in Express

Express also offers a variety of built-in middleware for common tasks, such as serving static files, parsing JSON, and URL-encoded payloads.

Example

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[Insert image here: Diagram showing the different types of middleware with examples of how they are integrated into the request lifecycle.]

Understanding these types of middleware and their uses will allow you to build more structured and efficient applications. In the next module, we will explore how to create custom middleware.