Boilerplate code for connecting to MongoDB Atlas in your Node.js application

index.js

const express = require('express');
const cors = require('cors');
const MongoClient = require('mongodb').MongoClient;

const app = express();
app.use(express.json());
app.use(cors());
app.use(express.urlencoded({ extended: true }));

let db

app.get('/health', (req, res) => {
    return res.status(200).send({ message: "GET /health successful" })
})

app.get('/addUser', async (req, res) => {
    // name, age 
    const { name, age } = req.query

    await db.collection("users").insertOne({
        name,
        age,
        complex: {
            can: "be literally anything",
            date: Date()
        }
    })

    return res.status(201).send({
        message: "User created successfully."
    })
})

app.get('/addTeacher', async (req, res) => {
    // name, age 
    const { name, age } = req.query

    await db.collection("users").insertOne({
        name,
        age,
        complex: {
            can: "be literally anything",
            date: Date(),
            test: [
                "hello",
                "there"
            ]
        }
    })

    return res.status(201).send({
        message: "User created successfully."
    })
})

const connectToDB = async () => {

    const uri = "mongodb+srv://superuser:superpassword@cluster0.w2do3.mongodb.net/test?retryWrites=true&w=majority";
    const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });
    client.connect(err => {
        if (err) {
            console.log(err)
        }
        db = client.db("test");
        console.log("Connected to the database")

        // client.close();
    });

}

app.listen(9000, () => {
    console.log(`Listening on Port 9000`)
})

connectToDB()