Node.js REST API Docker Project | Cloud and DevOps Engineer
In this hands-on project tutorial, you will containerize a complete Node.js Express REST API using Docker Compose. You will build the image, start the container, configure health checks, inject environment variables, test all CRUD endpoints with curl, and understand the full project file structure and Docker layer caching best practices.
Git-Repo: https://github.com/dheeraj3choudhary/...
What You Will Learn:
Project file overview: index.js, package.json, docker-compose.yml, .dockerignore, .gitignore, .env.example
Why .dockerignore must exclude node_modules to prevent local modules overwriting container-installed ones and to avoid cache invalidation
Docker layer caching strategy: COPY package.json first, run npm install, then COPY source code for faster rebuilds
Building the image: docker compose build reads docker-compose.yml, downloads node:18-alpine, installs npm dependencies, copies app code
Starting in detached mode: docker compose up -d and verifying with docker-compose ps
Health check configuration: interval 30 seconds, GET / endpoint returning status healthy
Environment variables: NODE_ENV=production and PORT=3000 injected via docker-compose.yml
Port mapping: 3000:3000 maps host port 3000 to container port 3000
Testing all REST API endpoints with curl:
GET /api/items (list all items)
GET /api/items/:id (single item)
POST /api/items with JSON body (create)
PUT /api/items/:id with JSON body (update)
DELETE /api/items/:id (delete)
Why data resets on docker-compose down: in-memory array storage has no volume persistence
How to add a named volume to persist data (contrast with Flask blog project)
Stopping cleanly: docker-compose down
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