NestJS Basic 2

Question 1

Which decorator is used to define a NestJS controller?

Accepted Answer

@Controller()

Answer

@Controller() marks a class as a NestJS controller that handles incoming HTTP requests.

Question 2

What does the @Get() decorator do in NestJS?

Accepted Answer

Defines a GET HTTP route handler

Answer

@Get() maps an HTTP GET request to a specific controller method.

Question 3

Which file is the entry point of a NestJS application?

Accepted Answer

main.ts

Answer

main.ts bootstraps the NestJS application using NestFactory.create().

Question 4

What is the purpose of the @Injectable() decorator in NestJS?

Accepted Answer

Marks a class as a provider that can be injected

Answer

@Injectable() marks a class as a provider so NestJS's IoC container can manage and inject it.

Question 5

How do you extract a route parameter from a URL like /users/:id in NestJS?

Accepted Answer

@Param('id')

Answer

@Param('id') extracts named route parameters from the URL path.

NestJS Practice Test