Install the dependencies

In this tutorial, you will use the express web application framework to create the server and define the routes for your webhook endpoints.

You will access the JSON bodies of the requests that the Vonage API platform makes to your webhooks, so you'll need the body-parser package too.

Create a directory called phone-ivr for your application and change into it:

mkdir phone-ivr
cd phone-ivr

Run npm init to create a node application in the phone-ivr directory and accept all the defaults.

Then, install express and body-parser:

npm install express body-parser