Hapijs - modifying responses with API calls

server.js

'use strict';

const Hapi = require('hapi');

const server = new Hapi.Server();

server.connection({ port: 3000 });

// our route with normal output
server.route({
	path:'/',
	method:'get',
	handler: function (request, reply) {

		const myData = [
			{
				'id': 1,
				'email': 'jdoe@bla.com'
			},
			{
				'id': 2,
				'email': 'jsmith@bla.com'
			}
		];
		reply(myData);
	}
});

const checkForEmailsAPI = function (data) {

	//here we can make our async API calls or something
	//and return a promise, or you can use a callback if you want

	//using promise.all to wait for an API call for every item on the list
	return Promise.all(data.map((item) => {

		//we are simulating an api call with promise.resolve
		return Promise.resolve(Object.assign(item, { name: item.email.split('@')[0] }));
	}));
}

server.ext('onPreResponse', function (request, reply) {

	const response = request.response;
	const myData = response.source; //the value provided using the reply interface.

	//lets call our function that knows what to do with the data
	checkForEmailsAPI(myData)
		.then((newData) => {

			//here is my new data, lets reply that
			reply.continue(newData);
		});
});

server.start((err) => {

	if (err) {
		throw err;
	}

	console.log(`server running at: ${server.info.uri}`);
})