Middleware in Action: From Authentication to Error Handling, Unleashing Its Power

Middleware refers to a component that sits between the web server and the application.

In any request-response cycle, the middleware has the capability to hook in between and perform some actions.

It is designed to allow developers to modify an incoming request and an outgoing response, and they can interact with the data in these requests and responses to perform specific functionalities.

Below are few scenarios where middleware is widely used

1.Authentication (i.e. Check if an incoming request has a real user objectassociated with it.)

2. Caching: An approach to improve the performance of an application by preventing subsequently database query if such request has already been made(I.e. it exists in the cache).

3. Logging: Keeping tracks of activities the application

4.Input validation: Validating user input before processing it in the application. i.e. Checking if the request contains certain token

5.Error handling: Capturing and handling errors that may occur during the request-response cycle.

6.Content negotiation: Determining the most appropriate format for the response based on the client's preferences and capabilities.

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