server.js

const express = require('express');
const User = require("./models/mongodb");
const bodyParser = require("body-parser");
const path = require('path');
const app = express();
const PORT = process.env.PORT || 8000;
var alert = false;

app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.use('/', express.static(path.join(__dirname, 'public')))

app.set('view engine', 'ejs');

app.get('/', async (req, res) => {
    const userRecords = await User.find();
    // console.log(data);
    res.render('index', { alert: false, records: userRecords });
})
app.get('/addDetails', (req, res) => {
    res.render('addDetails', { alert: false, title: "Add New User", record: {} });
})

app.get('/updateDetails/:id', (req, res) => {
    var id = req.params.id
    var title;
    User.findById(id, (err, data) => {
        // console.log(data)
        if (err) throw err;
        res.render("updateDetails", { title: "Update User", record: data, alert: false });
    })
})

app.post("/", async (req, res) => {

    const userRecords = await User.find();
    try {
        //   res.send(req.body);
        const userData = new User(req.body);
        await userData.save();

        res.status(201).render("addDetails", { alert: true, record: userRecords, title: "Add New User" });
    } catch (error) {
        console.log(error);
        res.status(500).render('index', { alert: false, records: userRecords });
    }

});
app.post("/updateDetails/:id", async (req, res) => {
    console.log('user updating')
    const id = req.params.id;
    try {
        const record = await User.findByIdAndUpdate(id, req.body)
        res.status(201).render("updateDetails", { alert: true, record: {}, title: "Update User" });
    } catch (e) {
        console.log('some error occured' + e);
    }
});

app.get('/delete/:id', (req, res) => {
    User.findByIdAndRemove(req.params.id, (err, doc) => {
        if (!err) {
            res.redirect('/');
        }
        else { console.log('Error in employee delete :' + err); }
    });
});

app.listen(PORT, () => {
    console.log(`server is listening on PORT ${PORT}`);
})