NestJS Technology & Digital Applications 5

Question 1

How does NestJS support versioning for REST API endpoints?

Accepted Answer

Via URI, header, media type, or custom versioning strategies built into the framework

Answer

NestJS has built-in API versioning supporting URI (v1/v2), header-based, media-type, and custom strategies configured at the application level.

Question 2

What does the `@Render()` decorator do in NestJS?

Accepted Answer

Renders an HTML template view using the configured template engine

Answer

@Render() tells the controller method to render a named template file using the configured view engine (e.g., Handlebars, Pug).

Question 3

In NestJS, what is the difference between `useGlobalPipes()` and providing a pipe with `APP_PIPE`?

Accepted Answer

useGlobalPipes() is set outside DI context so the pipe cannot inject dependencies; APP_PIPE works within DI

Answer

useGlobalPipes() registers a pipe outside the DI container, so the pipe can't use dependency injection; using APP_PIPE token inside a module allows full DI support.

Question 4

Which decorator in NestJS is used to set custom HTTP response headers?

Accepted Answer

@Header()

Answer

@Header(name, value) sets a custom response header on the HTTP response for that route handler.

Question 5

What role does `Reflector` play in NestJS guards and interceptors?

Accepted Answer

It reads metadata set by decorators like @SetMetadata() from handlers and classes

Answer

Reflector is a helper class injected into guards/interceptors to read custom metadata attached via @SetMetadata() or other metadata decorators.

NestJS Practice Test

NestJS Practice Test

NestJS Technology & Digital Applications 5