Verifying Docker Compose Setup

Before running Docker Compose, delete the old containers that were previously created so there are no port conflicts. Then run the compose command.

After running, visit:

localhost:8081

The same Mongo Express UI will open. We can create our database, add collections, and add documents just as before.

What We Should See

If everything is working correctly:

• MongoDB container is running
• Mongo Express container is running
• Both containers are connected via Docker Compose network

Verification Steps

1. Create Database

Create a database named:

college-db

2. Create Collection

Inside college-db, create a collection:

users

3. Add a Document

Insert a sample document:

{
  "email": "john@yahoo.in",
  "username": "JohnDoe",
  "password": "secret"
}

4. Test API Connection

Now send a GET request to:

localhost:5050/get-users

Expected Output

The data will be visible in the response.

This confirms:

• MongoDB is running inside Docker Compose
• Mongo Express is connected to MongoDB
• Node.js application is successfully connected to the database
• Data inserted in Mongo Express is accessible via API

Final Result

We now have a fully working system:

• Node.js application (backend)
• MongoDB database (containerized)
• Mongo Express UI (browser interface)
• Docker Compose managing all containers

All components are connected and working together without installing MongoDB locally.