: Services , repositories, and helpers are treated as "Providers." They are injected into classes (like controllers) through Dependency Injection , ensuring loose coupling and easier testing.
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: Used for data validation and transformation . For example, the ParseIntPipe can automatically convert a string parameter into an integer before it reaches your logic. : Services , repositories, and helpers are treated
: NestJS organizes code into Modules , which encapsulate related functionality. This makes large codebases manageable, testable, and reusable. there are several high-quality