index.js

const express = require('express');

const urlRoute = require('./routes/url');

const URL = require('./models/url');
const { connectDB } = require('./connect');
const app = express();
const PORT = 8001;

connectDB('mongodb://localhost:27017/url-shortener').then(() => {
    console.log("Connected to DB");
});

app.use(express.json());

app.use("/url", urlRoute)

app.get('/:shortId', async (req, res) => {
    const shortId = req.params.shortId;
    const entry = await URL.findOneAndUpdate(
        {
            shortId
        }, 
        { 
            $push: {
            visitHistory: {
                timestamp: Date.now(),
            },
        }
    });
  res.redirect(entry.redirectUrl);
});

app.listen(PORT, () => console.log(`Server is running on port ${PORT}`));