NestJS NestJS 5

Question 1

Which NestJS package provides WebSocket gateway support?

Accepted Answer

@nestjs/websockets

Answer

The @nestjs/websockets package (combined with @nestjs/platform-socket.io or @nestjs/platform-ws) provides WebSocket support in NestJS via the @WebSocketGateway() decorator.

Question 2

What decorator is used to define a NestJS WebSocket gateway?

Accepted Answer

@WebSocketGateway()

Answer

@WebSocketGateway() decorates a class to define it as a WebSocket gateway, with optional port and namespace configuration.

Question 3

In NestJS microservices, which transport layer uses Redis for message passing?

Accepted Answer

Redis

Answer

NestJS includes a built-in Redis transport layer that uses Redis pub/sub for microservice communication between services.

Question 4

Which decorator marks a NestJS microservice message handler for a specific pattern?

Accepted Answer

@MessagePattern()

Answer

@MessagePattern() decorates a method in a microservice controller to handle messages matching a specific pattern sent by a client.

Question 5

What is the purpose of ClientProxy in NestJS microservices?

Accepted Answer

To send messages and emit events to a microservice from a client application

Answer

ClientProxy is injected into client applications using @Inject() with a client token and exposes send() and emit() methods to communicate with microservices.

NestJS Practice Test

NestJS Practice Test

NestJS NestJS 5