Why I Switched from Express to NestJS

## The Problem with Express Express is great for small APIs. But after building 3 production APIs with it, I started noticing patterns: - Routes were getting messy - No standardized way to handle validation - Dependency injection was manual and fragile - Testing was a pain ## Enter NestJS NestJS gave me structure. It's essentially Angular's architecture for the backend — modules, controllers, services, and dependency injection. ### What I Got - **TypeScript first**: Everything is typed, which catches bugs early - **Modular architecture**: Each feature is its own module with its own services - **Built-in validation**: DTOs with class-validator make input validation trivial - **Testing**: Dependency injection makes unit testing straightforward ## Was It Worth It? Yes. The initial learning curve paid off quickly. My APIs are more maintainable, easier to test, and new developers can understand the structure in minutes.