My first working Alexa skill with AWS Lambda

index.js

/** 
 * user setting
**/
const favBus = '38D';
const buses = ['38A', '38'];

const Alexa = require('alexa-sdk');

const APP_ID = '';  // TODO replace with your app ID (OPTIONAL).

const sendRequest = (self) => {
    var http = require("https");

    var options = {
      "method": "GET",
      "hostname": "data.dublinked.ie",
      "port": null,
      "path": "/cgi-bin/rtpi/realtimebusinformation?stopid=1666&format=json",
      "headers": {
        "cache-control": "no-cache",
        "postman-token": "a715bc18-b2a2-b710-8fbc-88c64239192d"
      }
    };
    
    var req = http.request(options, function (res) {
      var chunks = [];
    
      res.on("data", function (chunk) {
        chunks.push(chunk);
      });
    
      res.on("end", function () {
        var body = Buffer.concat(chunks);
        var result = body.toString();
        console.log(result);
        var res = parseResult(JSON.parse(result));
        console.log(res);
        self.emit(':tell', res);
      });
    });
    
    req.end();
}

const parseResult = (res) => {
    var otherBuses = '';
    
    const resArray = res.results;
    for (var i = 0; i < resArray.length; i++) {
        var route = resArray[i].route;
        if (route === favBus) {
            return route + ' is ' + resArray[i].duetime + ' minutes' + ' away';
        } else if (route === buses[0] || route === buses[1]) {
            otherBuses += route + ' is ' + resArray[i].duetime + ' minutes ' + ' away. ';
        }
    }
    
    if (otherBuses !== '') {
        return otherBuses
    }
    
    return 'bus not in sign';
}

const getBusTime = () => {
    sendRequest().then(function(result){
        console.log('Dublin Bus API call result:', result);
        if (!result) {
            return 'bus not in sign';
        } else {
            return parseResult(result);
        }
    });
}

const handlers = {
    'GetBusTime': function() {
        sendRequest(this)
    }
};

exports.handler = function (event, context) {
    const alexa = Alexa.handler(event, context);
    alexa.APP_ID = APP_ID;
    // To enable string internationalization (i18n) features, set a resources object.
    // alexa.resources = languageStrings;
    alexa.registerHandlers(handlers);
    alexa.execute();
};