Milestone 1: The Modular Core

🟦 Milestone 1: The Modular Core

Master the “IoC Container” and the module system that turns Node.js into an enterprise-grade platform.

🏗️ Core Modules

• Module 1: Dependency Injection: Understanding the “Pure” pattern vs the NestJS Container.
• Module 2: The Module System: Encapsulation, Exports, and “Global” modules.

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Milestone Goal

By the end of this milestone, you will understand how NestJS creates the application graph and why “Encapsulation” is the single most important rule for scalable codebases.

Tip

Insight: A NestJS Module is the “Boundary” of your logic. If you don’t export it, no one else can see it. This prevents the “Spaghetti Code” common in large Express apps.