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Library/Backend/NestJS
Medium Pro#nestjs

Khi nào dùng useValue, useClass, useFactory, useExisting trong NestJS?

February 15, 2026

Quick summary

Custom Providers in NestJS allow you to customize the Dependency Injection mechanism: `useValue` is for static values or mocking; `useClass` is for swapping implementations; `useFactory` handles dynamic or asynchronous initialization; and `useExisting` creates an alias while preserving the Singleton instance.

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Sample answer:

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam.

Quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore.

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