Docker Node.js MongoDB Setup | Express Backend + Dockerfile + Container Networking Explained | Hindi
In this chapter 9.5, we build a Node.js Express backend application and connect it with a MongoDB container running in Docker.
We start by setting up the backend project using Express, installing dependencies, and creating a simple API. While running the application locally, we encounter a common issue — the application cannot connect to MongoDB because it is running inside a Docker container.
To solve this, we introduce Docker into our backend workflow.
We create a development Dockerfile, build a Docker image, and run our backend inside a container connected to the same Docker network as MongoDB. This allows us to successfully connect to the database using the container name instead of localhost.
In this video, you will learn:
✔ How to create a Node.js Express backend
✔ How to connect Express app with MongoDB using Mongoose
✔ Why local apps cannot connect to Docker containers directly
✔ How to write a simple Dockerfile for Node.js
✔ How to build and tag Docker images
✔ How to run containers with networking
✔ How to connect services using Docker container names
✔ How to test APIs like /health endpoint
This lecture is essential for understanding real-world Docker development workflows and container networking concepts.
This chapter is part of our complete Docker & DevOps series designed for real-world projects and live deployment scenarios.
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