app.js

//Import Express
const express = require('express');
const cors = require("cors");
const mongoose = require("mongoose");
const passport = require('passport');
const path = require('path');
const config = require("./config");

try{

    // define directory
    global.__base = __dirname + '/';

    // All code in your mongoose schema js files should have run before it is used in other files.
    // For example, the following code snippet makes sure the mongoose schema files/modules are executed. https://stackoverflow.com/a/38970017/5385845
    require("fs").readdirSync(__dirname + '/app/models').forEach( (file)=> {
        if (~file.indexOf('.js')) require(__dirname + '/app/models/' + file);
    });



    // Initialize App
    const app = express();

    // View Engine
    const handlebars = require('express-handlebars')
    app.engine('.hbs', handlebars({
        // layoutsDir: __dirname+'/views',
        defaultLayout: 'main',
        extname: '.hbs'
    }))
    app.set('views', path.join(__dirname, 'views'));
    app.set('view engine', '.hbs')
    // app.use(express.static('./views'))

    //cors
    app.use(cors());


    // Database configuration
    mongoose.Promise = global.Promise;
    mongoose.connect(config.mongoURI, {
        useCreateIndex: true,
        useNewUrlParser: true,
        useUnifiedTopology: true
    });
    mongoose.connection.once('open', () => {
        console.log('MongoDB Ready...')
    }).on('error', (error) => console.log('Error connecting to MongoDB:', error));



    app.use(express.json({limit:'50mb'}));
    app.use(express.urlencoded({limit:'50mb', extended: false}));

    // passport configuration
    require('./app/config/passport');
    app.use(passport.initialize());

    // Send message for default route URL
    const apiRoutes = require("./app/routes/index");
    app.use('/api', apiRoutes);
    app.use('/docs', express.static(__dirname + '/apidoc'));

    // Launch app to listen to specified port
    const port = config.port;

    app.listen(port, () => { console.log("Running App on port " + port); });
    //listener = app.listen(null, () => { console.log("Running App on port " + listener.address().port); });
}catch (err){
    console.error("Error Starting Application...", err.message());
}