app.js

var express = require('express');
var mongoose = require('mongoose');
var bodyParser = require('body-parser');
var methodOverride = require('method-override');
var flash = require('connect-flash');
var session = require('express-session');
var passport = require('./config/passport');
var app = express();

require('dotenv').config()

// DB Setting
mongoose.set('useNewUrlParser', true);
mongoose.set('useFindAndModify', false);
mongoose.set('useCreateIndex', true);
mongoose.set('useUnifiedTopology', true);
mongoose.connect(process.env.MONGO_URI);
var db = mongoose.connection;
db.once('open', function () {
    console.log('DB Connected!');
});
db.on('error', function (err) {
    console.log('Error! : ', err);
});

// Setting
app.set('view engine', 'ejs');
app.use(express.static(__dirname + '/public'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(methodOverride('_method'));
app.use(flash());
app.use(session({ secret: 'MySecret', resave: true, saveUninitialized: true }));
app.use(passport.initialize());
app.use(passport.session());

// Custom Middlewares
app.use(function (req, res, next) {
    res.locals.isAuthenticated = req.isAuthenticated();
    res.locals.currentUser = req.user;
    next();
});

// Route
app.use('/', require('./routes/index'));
app.use('/posts', require('./routes/posts'));
app.use('/users', require('./routes/users'));

// Port Setting
var port = 3000;
app.listen(port, function () {
    console.log('Server is Connect! http://localhost:' + port);
});