text: //import npm package express
  let express = require("express");
  
  //import npm package body-parser to parse incoming requests. 
  let bodyParser = require("body-parser");
  
  //import node builtin package path
  let path = require("path");
  
  //use port defined by deployment site like Heroku or 8080 if its localhost
  let PORT = process.env.PORT || 8080;
  
  //create the server express
  let app = express();
  
  //parse the application/x-www-form-urlencoded
  app.use(bodyParser.urlencoded({extended: false}));
  
  //parse application/json
  app.use(bodyParser.json());
  
  //include html_routes in the server file and 
  //the app that we use is express
  require("./routing/html_routes.js")(app);
  require("./routing/api_routes.js")(app);
  
  app.listen(PORT, function(){
      console.log("App listening on PORT: " + PORT);
  });
  
  
  