🚀 Express + TypeScript + Docker Networking Demo

This is a simple Express application built using TypeScript.
Here, we learn how Docker networking works — specifically, how one container talks to another using Docker's built-in networking.

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🧠 What You'll Learn

• 📦 Running multiple containers
• 🔗 Connecting containers using Docker networks
• 🗃️ Connecting a backend to a MongoDB container

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🛠️ Setup Instructions

Follow these steps carefully:

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🔧 Step 1: Create a Docker Network

docker network create <your-network-name>

🔧 Step 2: Run MongoDB Container in the Network

docker run -d -p 27017:27017 --name mongo --network <your-network-name> mongo

🔧 Step 3: Update Connection String

const uri = "mongodb://mongo:27017/<your-db-name>";

🔧 Step 4: Run Your Backend App in the Same Network

docker build -t my-backend .
docker run -p 3000:3000 --name my-app --network <your-network-name> my-backend

Result = mongoDB connected

Docker-compose.yaml is added - will create two container

1. The mongogb will start.
2. The backend process will start.
3. Volume will be created to store the data.