1. Installation

🔗 Download MongoDB Link

1. Installing mongoose

npm i mongoose

import mongoose from 'mongoose';

2. Connect to Databse

    // ❌ mongoose.connect("mongodb://localhost:27017", {
    mongoose.connect("mongodb://127.0.0.1:27017", {
    dbName: "backend",
})

or

    // ❌ mongoose.connect("mongodb://localhost:27017", {
    mongoose.connect("mongodb://127.0.0.1:27017", {
    dbName: "backend",
}).then(() => {
    console.log("Database Connected");
}).catch((e) => console.log(e))

• How find the correct connection URI link
• Open your project folder directory.
• type cmd in directory path
• then in cmd type mongo
• it will show up the link through which you can connect to your mongoDB database.

3. Add data to backend

Creating Message Schema

const msgSchema = new mongoose.Schema({
    name: String,
    email: String,
})
const msg = mongoose.model("Message", msgSchema);

Add data using GET method

app.get('/add', (req, res) => {
    msg.create({
        name: "Ayu",
        email: "ayu@gmail.com"
    }).then(() => {
        res.send("<h1>Data Sent to Backend successfully.</h1>");
    })
})

or

// using async await function
app.get('/add', async (req, res) => {
    await msg.create({
        name: "Ayu",
        email: "ayu@gmail.com"
    }).then(() => {
        res.send("<h1>Data Sent to Backend successfully.</h1>");
    })
})

Add data using post method

app.post('/contact', (req, res) => {
    // msg.create({ name: 'youtube', email: 'subscribe@gmail.com' })    // 1
    // msg.create({ name: req.body.name, email: req.body.email })       // 2

    // destructuring data from req.body object
    const { name, email } = req.body;
    // msg.create({ name: name, email: email });
    msg.create({ name, email });    // if key value pairs have same name then write only once

    console.log('Message saved to DB successfully');
    res.redirect('/success')
})