node_mongo_crud.js

const MongoClient = require("mongodb").MongoClient;

const MongoServerUrl = "mongodb://localhost:27017";

const Config = {
    useNewUrlParser: true
};

MongoClient.connect(MongoServerUrl, Config, (err, client) => {
    MongoCrud(client, () => {
        client.close();
    })
});

function MongoCrud(client, callback) {
    let db = client.db("analytics");
    let collection = db.collection("sites");

    // Insert a new site
    collection.insertOne({
        "domain": "http://accounts.debojyoti.xyz"
    });

    // Display all sites
    collection.find().toArray((err, docs) => {
        console.log(docs);
    });

    // Remove some docs
    collection.deleteOne({
        "domain": "http://accounts.debojyoti.xyz"
    });

    // Print available sites again
    collection.find().toArray((err, docs) => {
        console.log(docs);
    });

    // Update
    collection.updateOne({
        "domain": "https://accounts.debojyoti.xyz"
    }, {
        $set: {
            "domain": "http://accounts.debojyoti.xyz"
        },
        $currentDate: {
            lastModified: true
        } 
    });

    // Print
    collection.find().toArray((err, docs) => {
        console.log(docs);
        callback();
    });
};