Async configuration in NestJS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import ConfigModule asynchronously.

NestJS

import { ConfigModule } from '@nestjs/config';

@Module({
  imports: [ConfigModule.[1]({
    isGlobal: true,
  })],
})
export class AppModule {}

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

Acreate

BforFeature

Cregister

DforRootAsync

Attempts:

3 left

💡 Hint

Common Mistakes

Using synchronous methods like forFeature instead of forRootAsync.

Trying to use register which is not a method of ConfigModule.

The forRootAsync method is used to configure modules asynchronously in NestJS.

2fill in blank

medium

Complete the code to provide a factory function for async config.

NestJS

ConfigModule.forRootAsync({
  useFactory: async () => {
    const config = await fetchConfig();
    return [1];
  },
}),

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

APromise.resolve(config)

Bconfig

Cawait config

D{ config }

Attempts:

3 left

💡 Hint

Common Mistakes

Returning an object with config as a property instead of the config itself.

Using await unnecessarily on a variable already awaited.

The factory function should return the config object directly.

3fill in blank

hard

Fix the error in the async config provider by completing the inject array.

NestJS

ConfigModule.forRootAsync({
  imports: [HttpModule],
  useFactory: async (httpService: HttpService) => {
    const response = await httpService.get('url').toPromise();
    return response.data;
  },
  inject: [[1]],
}),

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

AHttpModule

BHttpClient

CHttpService

DHttp

Attempts:

3 left

💡 Hint

Common Mistakes

Injecting the module instead of the service.

Using incorrect service names like HttpClient.

The inject array must list the provider tokens to inject, here HttpService.

4fill in blank

hard

Fill both blanks to create an async config that uses a class provider.

NestJS

ConfigModule.forRootAsync({
  useClass: [1],
  imports: [[2]],
}),

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

AConfigService

BHttpModule

CConfigModule

DAppModule

Attempts:

3 left

💡 Hint

Common Mistakes

Using the module name instead of the service class for useClass.

Importing the wrong module or no module at all.

The useClass option expects a class like ConfigService, and HttpModule is imported for HTTP features.

5fill in blank

hard

Fill all three blanks to create a complete async config with useFactory, inject, and imports.

NestJS

ConfigModule.forRootAsync({
  imports: [[1]],
  useFactory: async (configService: [2]) => {
    const settings = await configService.loadSettings();
    return settings;
  },
  inject: [[3]],
}),

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

AHttpModule

BConfigService

DAppModule

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up module and service names in imports and inject arrays.

Not importing the module that provides the injected service.

Import HttpModule for HTTP features, inject ConfigService to use in the factory function.