server.js

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

mongoose.connect(process.env.DB_URL, {
    useNewUrlParser: true,
    useUnifiedTopology: true
})

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

app.use(express.static('public'));

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 || 3000);