NestJS Research & Evidence-Based Practice 4

Question 1

Based on NestJS profiling research, which built-in module enables logging of route resolution time and middleware execution for performance analysis?

Accepted Answer

DevtoolsModule

Answer

DevtoolsModule (@nestjs/devtools-integration) integrates with the NestJS Devtools browser app to visualize and profile application internals.

Question 2

Evidence from NestJS documentation shows that which configuration approach is recommended for environment-specific settings like database URLs?

Accepted Answer

Using ConfigModule with .env files via @nestjs/config

Answer

ConfigModule from @nestjs/config loads environment variables from .env files and makes them available via ConfigService throughout the application.

Question 3

Research into NestJS microservices reveals that which transport layer uses Redis pub/sub for message passing between services?

Accepted Answer

Redis

Answer

The Redis transport in NestJS microservices uses Redis pub/sub to route messages between microservice instances.

Question 4

When analyzing NestJS OpenAPI documentation practices, which decorator applied to a DTO property describes it in the generated Swagger UI?

Accepted Answer

@ApiProperty()

Answer

@ApiProperty() from @nestjs/swagger annotates DTO class properties so they appear with correct type information in Swagger UI.

Question 5

Based on benchmark evidence, which NestJS technique reduces database query overhead by batching multiple related queries within a single request?

Accepted Answer

DataLoader pattern for N+1 resolution

Answer

The DataLoader pattern batches and caches database lookups within a single request cycle, preventing N+1 query problems especially in GraphQL resolvers.

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NestJS Research & Evidence-Based Practice 4