app.js

'use strict' 
/**
  *Module dependencies 
**/

const express = require('express') 
const logger  = require('morgan') 
const path    = require('path')
const cors    = require('cors')
const fs      = require('fs')

const bodyParser =  require('body-parser') 
const cookieParser = require('cookie-parser');

const appRouter = require('./routes/index') 
const app = express()

const errorHandler = require('./controller/error_handler')

/** 
 * A middleware is a function that works over an http request 
 * To use a middleware in express application  , write it as :
 * app.use(middleware)
*/ 

app.use(logger('dev'))
app.use(express.json())
app.use(express.urlencoded({ extended: false }))
app.use(cors())
app.use(bodyParser.json()) 
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')))

app.use('/', appRouter)
// app.get("/*" , (req , res) => {
// 	res.sendFile(path.join(__dirname , "public" , "index.html"))
// })
app.use(errorHandler)
/**
 * Connect to the database and listen to error and open event 
 */
 
const CONFIG = require('./config') 
const  mongoose = require('mongoose') 
mongoose.connect(CONFIG.URL , CONFIG.OPTIONS) 
	
const  db = mongoose.connection 
db.on('error' , console.error.bind(console , 'MongoDB connection error'))
db.on('open' , console.info.bind(console , 'Connection was okkkk'))

module.exports = app;