Why caching reduces response latency in NestJS - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the caching module in a NestJS app.

NestJS

import { [1] } from '@nestjs/cache-manager';

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AConfigModule

BLoggerModule

CHttpModule

DCacheModule

Attempts:

3 left

💡 Hint

Common Mistakes

Importing unrelated modules like HttpModule or LoggerModule.

The CacheModule is the built-in module in NestJS used to enable caching features.

2fill in blank

medium

Complete the code to register the CacheModule globally in the app module.

NestJS

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

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ACacheModule

BHttpModule

CConfigModule

DLoggerModule

Attempts:

3 left

💡 Hint

Common Mistakes

Registering the wrong module or forgetting to call register().

Using CacheModule.register() sets up caching globally in the NestJS app.

3fill in blank

hard

Fix the error in the method decorator to enable caching for a controller route.

NestJS

@[1]
@Get('data')
getData() {
  return this.service.getData();
}

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ACacheable()

BCacheInterceptor()

CCacheable

DCacheKey()

Attempts:

3 left

💡 Hint

Common Mistakes

Using decorators that do not exist or require arguments.

The correct decorator to enable caching on a route is @Cacheable without parentheses.

4fill in blank

hard

Fill both blanks to inject the cache manager and use it to set a cache value.

NestJS

constructor(@Inject([1]) private cacheManager: [2]) {}

async cacheData(key: string, value: any) {
  await this.cacheManager.set(key, value);
}

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ACACHE_MANAGER

BCacheManager

CCache

DCacheStore

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong injection tokens or types that don't exist.

Inject the cache manager token CACHE_MANAGER and type it as CacheManager to use caching methods.

5fill in blank

hard

Fill the blank to create a cache interceptor and apply it to a controller method.

NestJS

@UseInterceptors([1])
@Get('info')
async getInfo() {
  const data = await this.service.fetchInfo();
  return data;
}

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

ACacheInterceptor

BCacheModule

CCacheManager

DCacheService

Attempts:

3 left

💡 Hint

Common Mistakes

Using modules or services instead of the interceptor.

The CacheInterceptor is used to automatically cache responses of controller methods.