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Providers | NestJS - A progressive Node.js framework

docs.nestjs.com · 3,444 words · saved by 1 readers

Providers are a fundamental concept in Nest. Many of the basic Nest classes may be treated as a provider – services, repositories, factories, helpers, and so on. The main idea of a provider is that it can be injected as a dependency; this means objects can create various relationships with each other, and the function of "wiring up" these objects can largely be delegated to the Nest runtime system. In the previous chapter, we built a simple CatsController. Controllers should handle HTTP requests and delegate more complex tasks to providers. Providers are plain JavaScript classes that are declared as providers in a module. Let's start by creating a simple CatsService. This service will be responsible for data storage and retrieval, and is designed to be used by the CatsController, so it's a good candidate to be defined as a provider. Our CatsService is a basic class with one property and two methods. The only new feature is that it uses the @Injectable() decorator. The @Injectable() dec

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