How to use Mongoose Library In NodeJS

Mongoose is a popular Object Data Modelling (ODM) library for node.js with MongoDB, it simplifies data interaction and connection management. Mongoose provide tools to define schemas, perform validations, and execute queries in easy way compared to raw database interactions.

Step 1: Install mongoose library.

npm install mongoose

Step 2: Create index.js file

echo . > index.js

Step 3: Put this code in index.js file.

This below code demonstrates how to connect to a MongoDB database using Mongoose in a Node.js application. It first imports the Mongoose library and defines the MongoDB connection URI. The main function attempts to establish a connection to the MongoDB database using mongoose.connect, and logs a success message if the connection is successful. If an error occurs during the connection attempt, it logs the error message.

// File name: index.js

const mongoose = require('mongoose');

// MongoDB connection URI
const mongoURI = 'mongodb://localhost:27017/university';

async function main() {
    try {
        // Connect to the MongoDB with the connection URI
        await mongoose.connect(mongoURI); 

        console.log('Database connected successfully');

    } catch (error) {
        console.error('MongoDB connection error:', error);
    }
}

main();

Output:

Explanation:

• The mongoose.connect function is called within the main function, where it receives the connection URI as a parameter.
• Error handling for potential connection failures is implemented within a try…catch block.

Efficiently managing database connections is important for Node.js applications using MongoDB. MongoDB connection reuse in Node.js is a practice that optimizes resource utilization and enhances application performance.

By reusing connections, developers can reduce the overhead associated with establishing new connections for each database interaction, especially in high–traffic applications.

In this article, We will explore various methods of easily reusing MongoDB connections across routes in Node.js projects with the help of examples and so on.