NestJs Questions

NestJS allows defining multiple route paths for a single method by providing an array of strings as the first argument to the route decorator (@Get(), @Post(), etc.).

The useFactory property in a FactoryProvider is used to define a factory function. This function is responsible for creating and returning an instance of the provider. It can be asynchronous and can inject dependencies.

The getStatus() method allows the filter to access the appropriate HTTP status code from the caught exception, enabling it to set the correct status code for the error response.

In NestJS, a Controller can access a Service's methods by injecting an instance of the Service through the Controller's constructor. This is facilitated by NestJS's Dependency Injection mechanism.

Classes acting as Interceptors in NestJS must implement the NestInterceptor interface, which provides the intercept method for handling requests and responses.

While singletons offer benefits like shared state and reduced instantiation overhead, overusing them can lead to increased memory usage (as instances persist), slower startup (due to potential initialization chains), and challenges in isolating components during testing.

NestJS uses standard HTTP methods for routing. RENDER is not a standard HTTP method; it's often associated with server-side templating engines.

The nest new command followed by your desired project name is the standard way to start a new NestJS project using the CLI.

The imports array is used to establish dependencies between modules in NestJS. When you import a module, its exported components become available for use within the importing module.

Controllers are always defined within a specific module in NestJS. This association determines their scope and how they are managed within the application's structure.