Docker's rising popularity is attributed to its ability to provide a consistent deployment environment for applications, and this text explores using Docker to containerize a Node.js web application integrated with Couchbase, a NoSQL database. Node.js, an open-source, cross-platform JavaScript runtime, is paired with Couchbase to build a custom container, emphasizing the need for a configuration script to provision the Couchbase server effectively. The guide walks through creating Dockerfiles and configuration scripts for a custom Couchbase image, detailing how to set up environment variables to avoid hardcoding sensitive information. It further explains how to develop a simple Node.js RESTful API, which communicates with Couchbase through defined endpoints, and how to containerize this application using Docker. A Docker Compose file is introduced to simplify deployment by managing environment variables and ensuring both Node.js and Couchbase containers run seamlessly on the same network, although care is advised to ensure Couchbase is ready before starting the Node.js application. This comprehensive approach to containerization underscores Docker’s utility in deploying web applications reliably across different environments.