AWS Node.js - How to get URL or Elastic IP of the server?

Question

Let's say I'm running my server on the url test.us-west-1.elasticbeanstalk.com. How can I get this URL from Node.js? Or the Elastic IP?

server.listen(port, error => {
    if(error){
        return console.error(error);
    }
    var CURRENT_DOMAIN = server.listen.url; // <--- should return 'test.us-west-1.elasticbeanstalk.com' or the Elastic IP
    console.log(`Server running on port: ${port} -- ${CURRENT_DOMAIN}`);
});