server.js

const express = require('express')
const mongoose = require('mongoose')
const app = express()
const ShortUrl = require('./models/shortUrl')

mongoose.connect('mongodb://localhost/urlShortner', {
    useNewUrlParser: true,
    useUnifiedTopology: true
})

app.set('view engine', 'ejs')
app.use(express.urlencoded({extended:false}))

app.get('/', async(req, res) =>{
   const shortUrls = await ShortUrl.find()
    res.render('index', {shortUrls:shortUrls})
})
 app.post('/shortUrls', async(req,res) =>{
 await ShortUrl.create({full: req.body.fullUrl})

 res.redirect('/')
 })
app.get('/:shortUrl', async (req,res) =>{
    const shortUrl = await ShortUrl.findOne({short: req.params.shortUrl })
    if(shortUrl == null) return res.sendStatus(404)

    shortUrl.clicks++
    shortUrl.save()

    res.redirect(shortUrl.full)
})

app.listen(process.env.PORT || 5000)