An older MongoDB Node.js connection example

Connecting to MongoDB involves both a server version and a client-driver version. The original note was labeled MongoDB 4.2.0, but its install commands did not pin a Node.js driver release.

npm i mongodb
npm i saslprep
npm i --save-dev @types/mongodb

The recorded connection flow

const MongoClient = require('mongodb').MongoClient;
const assert = require('assert');

// Connection URL
const url = 'mongodb://user:password@host:27017/database';
// Database Name
const dbName = 'example_database';

// Create a new MongoClient
const client = new MongoClient(url, {useNewUrlParser: true, useUnifiedTopology: true});

// Use connect method to connect to the Server
client.connect(function (err) {
  assert.equal(null, err);
  console.log("Connected successfully to server");
  const db = client.db(dbName);

  client.close();
});

The callback checks for a connection error, selects a database, and closes the client. The URI credentials and database name are illustrative values. Selecting a database does not show a query result or establish the application’s schema.

This is a historical callback-style example. Its constructor options, callback API, and separate type-package assumption should be checked against the driver actually installed before reuse. No database connection was made for this revision.

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