Controller decorator in NestJS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a basic controller with the correct decorator.

NestJS

import { [1] } from '@nestjs/common';

@[1]('cats')
export class CatsController {}

Drag options to blanks, or click blank then click option'

AInjectable

BService

CModule

DController

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Injectable instead of @Controller

Forgetting to import the decorator

Using @Module or @Service which are not for controllers

The @Controller decorator defines a controller class in NestJS. It takes an optional route prefix like 'cats'.

2fill in blank

medium

Complete the code to create a controller with the route prefix 'dogs'.

NestJS

import { Controller } from '@nestjs/common';

@Controller('[1]')
export class DogsController {}

Drag options to blanks, or click blank then click option'

Adogs

Bcats

Cbirds

Dfish

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different route prefix than the controller name

Leaving the prefix empty when a specific route is needed

The string inside @Controller() sets the route prefix. Here, it should be 'dogs' to match the controller name.

3fill in blank

hard

Fix the error in the controller decorator import statement.

NestJS

import { [1] } from '@nestjs/common';

@Controller('users')
export class UsersController {}

Drag options to blanks, or click blank then click option'

AController

Bcontroller

CControllers

DControl

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'controller' instead of 'Controller'

Misspelling the decorator name

The decorator must be imported with exact casing: Controller. JavaScript and TypeScript are case-sensitive.

4fill in blank

hard

Fill both blanks to create a controller with route prefix 'products' and export it.

NestJS

[1] { Controller } from '@nestjs/common';

@[2]('products')
export class ProductsController {}

Drag options to blanks, or click blank then click option'

Aimport

Bexport

CInjectable

DController

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'export' instead of 'import' for bringing in decorators

Using 'Injectable' instead of 'Controller' as decorator

You must import the Controller decorator and then use @Controller('products') to define the route prefix.

5fill in blank

hard

Fill all three blanks to define and export a controller with route prefix 'orders'.

NestJS

[1] { [2] } from '@nestjs/common';

@[3]('orders')
export class OrdersController {}

Drag options to blanks, or click blank then click option'

Aexport

Bimport

CController

DInjectable

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'export' instead of 'import' for the first blank

Using 'Injectable' instead of 'Controller' for the decorator

You import the Controller decorator, then use @Controller('orders') to set the route prefix.