Refactoring the app.js file with the new middleware

At this time, we have to do a major restructuring of the app.js file to include the new middleware that we will use.

We will show you step by step how to include each middleware and at the end, we will see the complete file:

1. Open app.js and add the following lines before var app = express():

         // ODM With Mongoose 
         var mongoose = require('mongoose'); 
         // Modules to store session 
         var session    = require('express-session'); 
         var MongoStore = require('connect-mongo')(session); 
         // Import Passport and Warning flash modules 
         var passport = require('passport'); 
         var flash = require('connect-flash'); 
   

   This is a simple import process.

2. Add the following lines after app.set('view engine', 'ejs'):

         // Database configuration 
         var config = require('./server/config/config.js'); 
         // connect to our database 
         mongoose.connect(config.url); 
         // Check if MongoDB is running 
         mongoose.connection.on('error', function() {
           console.error('MongoDB Connection Error. Make sure MongoDB is
            running.'); 
         }); 
    
         // Passport configuration 
         require('./server/config/passport')(passport); 
   

3. Note that we are using a config.js file in the first line; later we will create this file.
4. Add the following lines after app.use(express.static(path.join(__dirname, 'public'))):

         // required for passport 
         // secret for session 
         app.use(session({ 
             secret: 'sometextgohere', 
             saveUninitialized: true, 
             resave: true, 
             //store session on MongoDB using express-session +
             connect mongo 
             store: new MongoStore({ 
                 url: config.url, 
                 collection : 'sessions' 
             }) 
         })); 
    
         // Init passport authentication 
         app.use(passport.initialize()); 
         // persistent login sessions 
         app.use(passport.session()); 
         // flash messages 
         app.use(flash());