Why modules organize application structure in NestJS - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a basic NestJS module.

NestJS

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

@Module({
  [1]: [],
})
export class AppModule {}

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

Acomponents

Broutes

Cservices

Dcontrollers

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'components' instead of 'controllers'.

Confusing 'services' with module metadata keys.

The controllers array defines which controllers belong to the module.

2fill in blank

medium

Complete the code to import another module inside a NestJS module.

NestJS

import { Module } from '@nestjs/common';
import { UsersModule } from './users/users.module';

@Module({
  imports: [[1]],
})
export class AppModule {}

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

AUserController

BUsersModule

CUserService

DUserEntity

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to import a service or controller instead of a module.

Forgetting to add the imported module to the imports array.

The imports array includes other modules like UsersModule to organize features.

3fill in blank

hard

Fix the error in the module definition by completing the providers array.

NestJS

import { Module } from '@nestjs/common';
import { UsersService } from './users.service';

@Module({
  providers: [[1]],
})
export class UsersModule {}

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

AUsersController

BUsersModule

CUsersService

DUserEntity

Attempts:

3 left

💡 Hint

Common Mistakes

Adding controllers to providers array.

Adding modules or entities instead of services.

The providers array should include services like UsersService to be injectable.

4fill in blank

hard

Fill both blanks to export a service and import a module in a NestJS module.

NestJS

import { Module } from '@nestjs/common';
import { AuthService } from './auth.service';
import { UsersModule } from '../users/users.module';

@Module({
  imports: [[1]],
  providers: [AuthService],
  exports: [[2]],
})
export class AuthModule {}

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

AUsersModule

BAuthService

CUsersService

DAuthController

Attempts:

3 left

💡 Hint

Common Mistakes

Exporting modules instead of services.

Importing services instead of modules.

The imports array includes UsersModule to use its features.
The exports array makes AuthService available to other modules.

5fill in blank

hard

Fill all three blanks to create a module that imports another module, provides a service, and exports that service.

NestJS

import { Module } from '@nestjs/common';
import { PaymentsService } from './payments.service';
import { UsersModule } from '../users/users.module';

@Module({
  imports: [[1]],
  providers: [[2]],
  exports: [[3]],
})
export class PaymentsModule {}

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

AUsersModule

BPaymentsService

DUsersService

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing services and modules in imports or exports.

Not exporting the service to make it available elsewhere.

This module imports UsersModule to use user features.
It provides PaymentsService to handle payment logic.
It exports PaymentsService so other modules can use it.