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Providers | NestJS - A progressive Node.js framework

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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

Providers Providers are a core concept in Nest. Many of the basic Nest classes, such as services, repositories, factories, and helpers, can be treated as providers. The main idea behind a provider is that it can be injected as a dependency, which lets objects form relationships with each other. The Nest runtime takes care of "wiring up" these objects. In the previous chapter, we built a basic CatsController. Controllers should handle HTTP requests and delegate more complex tasks to providers. In their simplest form, providers are plain JavaScript classes listed in the providers array of a…

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