NestJS Research & Evidence-Based Practice 5

Question 1

When researching NestJS WebSocket support, which gateway decorator registers a class as a WebSocket server listening on a specific namespace?

Accepted Answer

@WebSocketGateway()

Answer

@WebSocketGateway() marks a class as a WebSocket gateway and optionally accepts a port or namespace configuration object.

Question 2

Based on NestJS logging documentation, which built-in logger method should be used to record errors with optional stack trace context?

Accepted Answer

Logger.error()

Answer

Logger.error() accepts a message and an optional stack trace string as a second argument, making it appropriate for exception logging.

Question 3

Evidence from NestJS GraphQL documentation shows that which decorator defines a resolver method that handles a query returning a list of objects?

Accepted Answer

@Query()

Answer

@Query() marks a resolver method as handling GraphQL queries, including those that return arrays of typed objects.

Question 4

Based on NestJS research, which lifecycle hook is the correct place to perform cleanup tasks like closing database connections when the application shuts down?

Accepted Answer

onModuleDestroy()

Answer

onModuleDestroy() is called when a module is being destroyed during application shutdown, making it the right place for resource cleanup.

Question 5

Research into NestJS queue processing shows that which package integrates BullMQ for background job processing?

Accepted Answer

@nestjs/bullmq

Answer

@nestjs/bullmq is the official NestJS package that wraps BullMQ for type-safe, Redis-backed background job queue processing.

NestJS Practice Test

NestJS Practice Test

NestJS Research & Evidence-Based Practice 5