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NestJS explained: the architecture every backend needs

If you come from Express, NestJS may seem like overengineering at first. But when your app grows, you understand why it exists.

The Express problem

Express gives you total freedom — great until you have 50 routes and 3 devs in the same codebase.

NestJS: structure from day 1

Modules, controllers, and services cleanly separated following the single responsibility principle.

Dependency injection

The NestJS DI container automatically resolves dependencies between classes.