Understanding middleware in Node.js

Think of middleware as a group of filters. Every request to your server passes through these filters one by one. Each filter performs a specific task. These tasks can be cooking parsing, authentication etc. There are written modules (middlewares) that you can use or you can write your own.

Since each request passes through each filter, you have to make sure that they are placed in the code in the correct order. For example a cookie parser should be run before a session handler.

All the dependencies we have installed are going to be used as middlewares and integrated in our code. This task will be done within the config module.

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