Node.js Application Connection to MongoDB

This guide shows how to connect a Node.js application server to MongoDB. The workflow covers preparing Node.js and MongoDB servers, connecting through SSH, installing the official MongoDB driver, creating a simple JavaScript connection script, and verifying the connection from the terminal.

Prepare Node.js and MongoDB

You need both a Node.js application server and a MongoDB server. They can be hosted within the platform or on external resources. The source example places both instances inside a single environment.

Connect to the Node.js Server

Install the MongoDB Driver for Node.js

Download and install the official MongoDB driver for Node.js:

npm install -s mongodb

Wait for npm to complete the package installation.

Create the MongoDB Connection Script

Create a JavaScript file using any preferred text editor and any filename with a .js extension. The source example uses:

vim script.js

Add the following connection script:

var MongoClient = require('mongodb').MongoClient;

// Connect to the db
MongoClient.connect(
    "mongodb://{user}:{password}@{host}:{port}/{database}",
    { useUnifiedTopology: true, useNewUrlParser: true },
    function(err, db) {
        if (!err) {
            console.log("You are connected!");
        }
        db.close();
    }
);

Replace the placeholders in the MongoDB connection string using the information supplied for the MongoDB node:

The required MongoDB connection data is provided in the email sent for the MongoDB node.

Run and Verify the Connection

Run the JavaScript file with Node.js:

node script.js

If all connection values are correct, the terminal displays:

You are connected!

After the connection test succeeds, extend the Node.js code with the MongoDB operations required by the application.

Expected Result

The Node.js application has the official MongoDB driver installed, connects to the specified MongoDB database through the configured connection string, prints the successful connection message, and then closes the database connection.

Important Notes

• Node.js and MongoDB can be hosted within the platform or on external resources.
• The source example hosts both instances in one environment.
• The documented installation command is npm install -s mongodb.
• The source script uses MongoClient.connect() with useUnifiedTopology and useNewUrlParser.
• The documented MongoDB default port is 27017.
• MongoDB connection details are provided in the email for the MongoDB node.
• The connection test prints You are connected! when successful.