twitter.js

/* Setting things up. */
var path = require('path'),
    express = require('express'),
    app = express(),   
    Twit = require('twit'),
    config = {
    /* Be sure to update the .env file with your API keys. */      
      twitter: {
        consumer_key: process.env.CONSUMER_KEY,
        consumer_secret: process.env.CONSUMER_SECRET,
        access_token: process.env.ACCESS_TOKEN,
        access_token_secret: process.env.ACCESS_TOKEN_SECRET
      }
    },
    T = new Twit(config.twitter);

// For static files
app.use(express.static('public'));

/* You can use uptimerobot.com or a similar site to hit your /BOT_ENDPOINT to wake up your app and make your Twitter bot tweet. */

app.all("/" + process.env.BOT_ENDPOINT, function (request, response) {  
  console.log("Waking up the application.");
});

var listener = app.listen(process.env.PORT, function () {
  console.log('Your bot is running on port ' + listener.address().port);
});

var cron = require('node-cron');
var rpn = require('request-promise-native');

// Helper functions
String.prototype.replaceAll = function(search, replacement) {
    var target = this;
    return target.split(search).join(replacement);
};

cron.schedule('0 0 */6 * * *', function(){ // Every six hours
  rpn.get('https://en.wikipedia.org/w/api.php?action=query&list=random&rnlimit=1&rnnamespace=0&format=json')
    .then(response => {
      let title = JSON.parse(response).query.random[0].title;
      let wikipedia_url = "https://en.wikipedia.org/wiki/" + title.replaceAll(" ", "_");
      T.post('statuses/update', { status: title + "\n" + wikipedia_url });
  });
});