Express.js Tutorial – Basic to Advance

In this tutorial, we will learn how to use Express.js to build web applications ranging from basic to advanced functionalities. Express.js is a popular Node.js framework that simplifies the process of building web applications by providing a robust set of features and tools.

Connect to a MongoDB Database Using Node.js

One of the key features of Express.js is its ability to easily connect to databases such as MongoDB. MongoDB is a popular NoSQL database that is commonly used in web development for its flexibility and scalability.

To connect to a MongoDB database using Node.js, we first need to install the required dependencies. We can do this by running the following command in our project directory:

npm install mongoose

Once the mongoose package is installed, we can create a connection to our MongoDB database by including the following code in our Node.js application:

    const mongoose = require('mongoose');

    mongoose.connect('mongodb://localhost/mydatabase', {
        useNewUrlParser: true,
        useUnifiedTopology: true
    }).then(() => {
        console.log('Connected to MongoDB');
    }).catch((error) => {
        console.error(error.message);
    });
    

With this code, we are establishing a connection to a MongoDB database named “mydatabase” running on the localhost. If the connection is successful, we log a message to the console. Otherwise, we log an error message.

Once we have successfully connected to our MongoDB database, we can perform various operations such as inserting, updating, and querying data. Express.js makes it easy to integrate these database operations into our web application.

Overall, connecting to a MongoDB database using Node.js and Express.js is a straightforward process that allows us to leverage the power of MongoDB in our web applications. By following this tutorial, you will be able to build robust and scalable web applications with ease.