Writing router-level middleware functions

Router-level middleware functions are only executed inside a router. They are usually used when applying a middleware to a mount point only or to a specific path.

Getting ready

In this recipe, you will create a small logger router-level middleware function that will only log requests to paths mounted or located in the router's mounted path. Before you start, create a new package.json file with the following content:

{ 
    "dependencies": { 
        "express": "4.16.3" 
    } 
} 

Then, install the dependencies by opening a Terminal and running:

npm install

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