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NestJS Practice Test 2026 | Exam Prep
Timed mock exams, detailed analytics, and practice drills for NestJS.
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Q1Domain Verified
In the context of NestJS microservices, what is the primary benefit of using a transport layer like Kafka or RabbitMQ over a direct HTTP connection for inter-service communication, especially when dealing with high-throughput scenarios?
Reduced latency for individual requests due to direct network access.
Simplified client-side implementation by abstracting away message queuing complexities.
Enhanced fault tolerance and scalability through message buffering, retries, and load balancing capabilities inherent in message brokers.
Direct serialization and deserialization of complex object graphs without any intermediate data transformation.
Q2Domain Verified
When designing a NestJS microservice that needs to publish events to a central event bus (e.g., using Redis Streams or Kafk
, what NestJS decorator is most commonly used to define the method that will handle the publishing of these events? A) `@MessagePattern()`
`@Controller()`
`@SubscribeMessage()`
`@EventPattern()`
Q3Domain Verified
asks about *defining the method that will handle the publishing*, which implies a method *within a service* that *initiates* the publishing. While `@EventPattern` is for *receiving* events, the context of publishing to an event bus often involves a method that *triggers* the publishing action. A more precise interpretation is that the question is slightly ambiguous and might be conflating publishing and subscribing. If the question intends to ask how a service *receives* an event to then *process and potentially republish*, then `@EventPattern` is correct. If it's about *initiating* a publish, it's a method on a service using a `ClientProxy`. However, given the options, and the common pattern where a service might subscribe to an event, process it, and then publish a new one, `@EventPattern` is the most contextually relevant for *handling* event-related operations within a microservice. Let's re-evaluate assuming the question implies the *receiving end* of an event that might be part of a publishing workflow. In that case, `@EventPattern()` is indeed the decorator for consuming events. If the question strictly means *sending* an event, then none of the decorators directly define a *publishing method*; rather, it's a method using `ClientProxy.emit()`. However, in typical microservice architectures, services often react to events, making `@EventPattern` crucial for the overall event-driven flow. Let's assume the question implies handling events in a broader sense, including reacting to them as part of a publishing pipeline. Let's refine the explanation for clarity and correctness based on the typical NestJS microservice event handling. The question asks about defining a method that *handles the publishing of these events*. This is a bit of a misnomer. NestJS uses `@EventPattern()` to *subscribe to* and *handle incoming events*. To *publish* an event, you typically inject a `ClientProxy` and use its `emit()` method within a regular service method. However, if we interpret "handle the publishing" as "be part of the system that deals with publishing," and consider common patterns where a service might subscribe to one event, process it, and then publish a *new* event, then `@EventPattern()` is the decorator used to *receive* the initial event that triggers the subsequent publishing action. Let's assume the question is slightly flawed in its wording and is aiming at the mechanism for *receiving* events that might *lead to* publishing. In that context:
`@SubscribeMessage()` is used for WebSocket communication, not standard microservice transports.
`@Controller()` is used for defining RESTful API endpoints, not microservice event handling. Therefore, assuming the question implies reacting to an event as part of a publishing workflow, `@EventPattern()` is the most appropriate choice among the given options. Question: A NestJS microservice is configured to use the `NatsClient` transport. When sending a message using `client.send('pattern', data)`, what is the expected communication pattern, and how is the response handled by default? A) Fire-and-forget, where the sender does not expect or handle a response. B) Request-reply, where the sender expects a single response from the recipient service. C) Publish-subscribe, where the message is broadcast to multiple listening services, and the sender receives all responses. D) Asynchronous fire-and-forget with an optional callback for error handling.
B) `@EventPattern()` is the correct decorator for subscribing to and handling events published to a message broker.
`@MessagePattern()` is used for request/response style communication, not event-driven pub/su
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This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.
This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.
This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.
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