How to do it...

1. Create a new file named router-level.js
2. Initialize a new ExpressJS application and define a router:

      const express = require('express') 
      const app = express() 
      const router = express.Router() 

1. Define our logger middleware function:

      router.use((request, response, next) => { 
          console.log('URL:', request.originalUrl) 
          next() 
      }) 

1. Mount the Router to the path "/router"

      app.use('/router', router) 

1. Listen on port 1337 for new connections:

     app.listen( 
         1337, 
       () => console.log('Web Server running on port 1337'), 
    ) 

1. Save the file
2. Open a terminal and run:

      node router-level.js

1. In your web browser navigate to:

 http://localhost:1337/router/example

1. The Terminal should display:

      URL: /router/example

1. After, in your web browser, navigate to:

      http://localhost:1337/example

1. No logs should be displayed in terminal