server.js

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

mongoose.connect('mongodb://localhost/urlShortener', {
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);