server.js

const express = require("express");
const mongoose=require("mongoose");
const ShortUrl=require('./models/url')
const app=express();
mongoose.connect('mongodb://127.0.0.1/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);