server.js

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

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);