Modular route handlers

ExpressJS has a built-in class called router. A router is just a class that allows developers to write mountable and modular route handlers.

A Router is an instance of ExpressJS' core routing system. That means, all routing methods from an ExpressJS application are available:

const router = express.Router() 
router.get('/', (request, response, next) => { 
  response.send('Hello there!') 
}) 
router.post('/', (request, response, next) => { 
  response.send('I got your data!') 
}) 

Getting ready

In this recipe, we will see how to use a router to make a modular application. 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

How to do it...

Suppose that you want to write a modular mini-application within your ExpressJS main application that can be mounted to any URI. You want to be able to choose the path...