Routing & Request Handling — Chapter Quiz

Question 1

1

Which decorator reads the JSON request body?

A@Query()B@Param()C@Body()D@Headers()

@Body() injects the parsed request body. Pass a key argument to pluck a single field.

Question 2

2

What does @HttpCode(204) do?

AThrows a 204 errorBOverrides the default success status for the routeCValidates the response bodyDAdds a Content-Type header

It sets the response status when the handler resolves successfully. Useful for DELETE or status-only endpoints.

Question 3

3

Which decorator reads the value of /users/42's 42?

A@Query('id')B@Param('id')C@Body('id')D@Headers('id')

Path segments declared with :id are read with @Param('id').

Question 4

4

What does @Redirect('/login', 302) do on a handler?

AForwards the request internallyBReturns a 302 redirect to /loginCThrows an UnauthorizedExceptionDRewrites the URL in middleware

@Redirect(url, code) returns a redirect response. Return an object to override the URL or status at runtime.

Question 5

5

Which decorator reads the ?page=2 part of a URL?

A@Param('page')B@Query('page')C@Body('page')D@Header('page')

Query string params come in via @Query(). Combine with class-validator DTOs for safe parsing.

Question 6

6

A Nest route handler can return a Promise and Nest will await it.

TTrueFFalse

Returning a Promise (or async function) is fully supported — Nest awaits it and serialises the resolved value.

Question 7

7

To create a parameter decorator, you use the createParamDecorator(___) factory from @nestjs/common.

createParamDecorator takes a function (data, ctx) => value and returns a new decorator.

Question 8

8

Which decorators set the HTTP verb of a handler?

Select all that apply.

A@GetB@ModuleC@PostD@Put

@Get, @Post, @Put, @Patch, and @Delete set the HTTP method. @Module registers a module — nothing to do with routing.

Test what you learned.