Connect to a MongoDB Database Using Node.js

1. Reference: https://www.mongodb.com/blog/post/quick-start-nodejs-mongodb--how-to-get-connected-to-your-database

2. Session
[malex@thermalite mongodb-atlas-client]$ ls -l
total 0
[malex@thermalite mongodb-atlas-client]$ npm init -y
Wrote to /home/malex/nodejs/mongodb-atlas-client/package.json:

{
  "name": "mongodb-atlas-client",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}


[malex@thermalite mongodb-atlas-client]$ npm i mongodb -s
+ mongodb@3.5.9
added 20 packages from 11 contributors and audited 20 packages in 1.204s

1 package is looking for funding
  run `npm fund` for details

found 0 vulnerabilities

[malex@thermalite mongodb-atlas-client]$ vi connection.js

[malex@thermalite mongodb-atlas-client]$ cat connection.js

const { MongoClient } = require('mongodb');

async function main() {
    /**
     * Connection URI. Update , , and to reflect your cluster.
     * See https://docs.mongodb.com/ecosystem/drivers/node/ for more details
     */
    const uri = "mongodb+srv://node_user:pass123@cluster101.n7nqjv.mongodb.net/test?retryWrites=true&w=majority";


    /**
     * The Mongo Client you will use to interact with your database
     * See https://mongodb.github.io/node-mongodb-native/3.3/api/MongoClient.html for more details
     */
    const client = new MongoClient(uri);

    try {
        // Connect to the MongoDB cluster
        await client.connect();

        // Make the appropriate DB calls
        await listDatabases(client);

    } catch (e) {
        console.error(e);
    } finally {
        // Close the connection to the MongoDB cluster
        await client.close();
    }
}

main().catch(console.error);

/**
 * Print the names of all available databases
 * @param {MongoClient} client A MongoClient that is connected to a cluster
 */
async function listDatabases(client) {
    databasesList = await client.db().admin().listDatabases();

    console.log("Databases:");
    databasesList.databases.forEach(db => console.log(` - ${db.name}`));
};


[malex@thermalite mongodb-atlas-client]$ node connection
(node:351200) DeprecationWarning: current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.
Databases:
 - sample_airbnb
 - sample_analytics
 - sample_geospatial
 - sample_mflix
 - sample_restaurants
 - sample_supplies
 - sample_training
 - sample_weatherdata
 - admin
 - local
[malex@thermalite mongodb-atlas-client]$