How to Connect to MongoDB and retrieve the list of databases using Java? | MongoDB with Java

How to Connect to MongoDB and List Databases Using Java

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Introduction

Connecting to a database is one of the most fundamental tasks for any Java developer. In this guide, we will walk through how to establish a connection with a MongoDB server and programmatically retrieve a list of all existing databases using a simple Java program.

The Connection Process

To interact with MongoDB, we use the MongoClient object. This object acts as the bridge between your Java application and the database server. You typically need two pieces of information to start:

• Host Name: The address where your MongoDB server is running (e.g., localhost).
• Port Number: The specific port MongoDB is listening on (default is usually 27017).

Retrieving Database Details

Once the connection is established, we call the listDatabases() method. This method returns a collection of all databases currently hosted on the server, such as admin, config, local, and any custom databases you have created.

In the video tutorial, we demonstrate how to iterate through this list and display the details of each database directly in your console.

Summary of Steps

1. Initialize the MongoClient with your server credentials.
2. Invoke the listDatabases() method from the client object.
3. Loop through the results to print or process each database name.

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