How to connect Node.js program with MongoDB on CentOS and Fedora

This article will introduce how to connect Node.js applications to MongoDB. Also, configure MongoDB driver for nodejs using Mongoose node application on CentOS and Redhat systems.

Step 1: First conditions

We assume that node.js and mongodb are already installed on the system. If it is not installed, you can refer to the following article to complete the required installation.

1, How to install MongoDB on CentOS and Fedora

2, How to install Node.js on CentOS and Fedora

Step 2: Install the Mongoose module

Mongoose provides a simple schema-based solution for application data modeling, including built-in type conversion, validation, and more.

$ npm install mongoose

Step 3: Connect nodejs with mongodb

Create a test_server.js file and add the following content to the file.

// Sample script of Node.js with MongoDB Connection

// This code requires mongoose node module
var mongoose = require('mongoose');

// Connecting local mongodb database named test
var db = mongoose.connect('mongodb://127.0.0.1:27017/test');

// testing connectivity
mongoose.connection.once('connected', function() {
	console.log("Database connected successfully")
});

Now, let us use node to execute test_server.js. If you receive the message "database connected successfully", it means that the node.js application has successfully connected to the database.

$ node test_server.js
Database connected successfully

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