index.js

// Injecting environment variables
require('dotenv').config();

var path = require('path');
var express = require('express');
var cors = require('cors');
var compression = require('compression');
var serveStatic = require('serve-static');
var passport = require('passport');
var DBS = require('./dbs');
const PORT = process.env.PORT || 8003;

const app = express();
app.use(compression());
app.use(cors());

// Define routes
app.use(require('./routes'));

// Serve tilesets
global.dataRoot = path.join(__dirname, 'data');
app.use(serveStatic(path.join(__dirname, 'data'), {
    index: false
}));

/*
* Firstly we connect to a MongoDB server,
* Then we start listening for incoming requests
*/
DBS.EstablishConnection()
    .then(function () {
        console.log("MongoDB connection established!");
        const server = app.listen(PORT, function () {
            console.log('3D backend is running on http://localhost:' + PORT);
        });
    })
    .catch(function (error) {
        console.log("Database connection failure: " + error.err);
    });