https://github.com/IITC-College/express-js-app

Learning Goals

• Learn how to install only runtime dependencies inside Docker images
• Understand the difference between:
  • dependencies
  • devDependencies
• Reduce:
  • image size
  • installation time
  • attack surface

Part 1 — Inspect Current Dependencies

Scenario

By default:

npm ci

installs everything:

• production dependencies
• development dependencies

This includes tools that are not needed in production containers.

Examples:

• Jest
• TypeScript
• ESLint
• Testing libraries