Configuration namespaces in NestJS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the ConfigModule with a namespace.

NestJS

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

@Module({
  imports: [ConfigModule.forRoot({
    load: [() => ({ api: { url: 'http://localhost' } })],
    [1]: 'api',
  })],
})
export class AppModule {}

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

Anamespace

BenvFilePath

CisGlobal

Dcache

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'envFilePath' instead of 'namespace'.

Confusing 'isGlobal' with namespace.

Trying to use 'cache' for namespacing.

The namespace option scopes the configuration under a specific key.

2fill in blank

medium

Complete the code to access a namespaced config value using ConfigService.

NestJS

constructor(private configService: ConfigService) {}

getApiUrl() {
  return this.configService.get<string>([1]);
}

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

A'url'

B'api.url'

C'apiUrl'

D'config.api.url'

Attempts:

3 left

💡 Hint

Common Mistakes

Using just 'url' without the namespace prefix.

Using 'apiUrl' which is not the correct key.

Adding extra prefixes like 'config.api.url'.

When using namespaces, access values with dot notation like 'api.url'.

3fill in blank

hard

Fix the error in the code to properly inject a namespaced ConfigService.

NestJS

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

@Injectable()
export class ApiService {
  constructor(
    private readonly [1]: ConfigService,
  ) {}
}

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

Aconfig

BConfigService

CapiConfigService

DconfigService

Attempts:

3 left

💡 Hint

Common Mistakes

Using the class name 'ConfigService' as the parameter name.

Using unrelated names like 'apiConfigService' without proper injection.

Using generic names like 'config' that may cause confusion.

The injected parameter name should be configService to match the type and NestJS conventions.

4fill in blank

hard

Fill both blanks to define and use a namespaced configuration factory.

NestJS

const apiConfig = () => ({
  url: process.env.[1],
  key: process.env.[2],
});

ConfigModule.forRoot({
  load: [apiConfig],
  [3]: 'api',
});

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

AAPI_URL

BAPI_KEY

Cnamespace

DisGlobal

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase env variable names.

Using 'isGlobal' instead of 'namespace'.

Mixing up the order of blanks.

The environment variables are API_URL and API_KEY. The config module uses namespace to scope the config.

5fill in blank

hard

Fill all three blanks to create a typed ConfigService for a namespace.

NestJS

interface ApiConfig {
  url: string;
  key: string;
}

@Injectable()
export class ApiConfigService {
  constructor(private configService: ConfigService) {}

  get url(): string {
    return this.configService.get<[1]>(
      [2],
      [3],
    );
  }
}

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

AApiConfig

B'api.url'

C''

D'api.key'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'api.key' instead of 'api.url' for the URL getter.

Not providing a default value.

Using wrong generic type.

The generic type is ApiConfig. To get the URL, use 'api.url' as the key and provide an empty string as default.