First, get started by requesting an account from sales@mapquest.com. Once you have an account, create a new Application, and store the App Secret and AppId. You'll need these two pieces of information to get started with the Node SDK.
Installation
Install using npm:
npm install --save @mapquest/io
Usage
First require the library:
let mqioSdk = require('@mapquest/io');
Then create a context using the app secret and id:
let $mqioApp = new mqioSdk.ApplicationContext('{appId}', '{secret}');
You can then interact with the different services, as in the following examples.
Documentation
You can find out more and see examples at the MapQuest.io documentation.