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TOPIC OVERVIEW

NestJS/Microservices

Split a large backend into smaller services that can communicate and scale independently.

18 QuestionsExpertHigh Priority ~15 min read

Microservices architecture breaks an application into smaller services, with each service responsible for a specific business capability. NestJS provides abstractions for building these services and communicating through different transport mechanisms.

Communication can happen through patterns such as request-response or event-based messaging. Microservices can improve independent deployment and scaling, but they also introduce distributed-system problems such as network failures, message delivery, observability, and data consistency.

What you'll walk away knowing

How NestJS supports microservice architecture

How services communicate using different transport mechanisms

The difference between request-response and event-based communication

The trade-offs and challenges of distributed systems

1What is the difference between request-response and event-based (fire-and-forget) message patterns in NestJS microservices?ExpertHigh 2What is the @Payload() decorator and how do you use @Ctx() to access transport-specific context in NestJS microservices?ExpertHigh 3How do you connect a NestJS microservice to RabbitMQ?ExpertHigh 4How do you implement manual message acknowledgement with RabbitMQ in NestJS?ExpertHigh 5How do you implement a RabbitMQ topic exchange for routing messages to multiple queues based on routing keys in NestJS?ExpertHigh 6How does gRPC differ from REST and when would you choose it for inter-service communication in NestJS?ExpertHigh 7How do you implement an API Gateway pattern in NestJS that aggregates multiple microservices?ExpertHigh 8How do you implement distributed tracing across NestJS microservices?ExpertHigh 9What transport layers does NestJS support for microservices and how do you bootstrap a microservice?ExpertHigh 10How do you connect a NestJS microservice to Apache Kafka?ExpertHigh 11How do you handle Kafka message patterns and access message headers and partition info via KafkaContext in NestJS?ExpertHigh 12How do you set up gRPC in a NestJS microservice?ExpertHigh 13How do you implement a circuit breaker pattern when calling a downstream microservice in NestJS?ExpertHigh 14How do you inject and use a ClientProxy to communicate with another microservice in NestJS?ExpertHigh 15How do you handle errors in microservice request-response patterns and propagate them to the caller in NestJS?ExpertHigh 16How do you implement Kafka consumer groups and what guarantees does partition assignment give you in NestJS?ExpertHigh 17How do you implement the outbox pattern with Kafka in NestJS to guarantee exactly-once message delivery?ExpertHigh 18How do you implement gRPC streaming including server-side, client-side, and bidirectional streaming in NestJS?ExpertHigh 19What is the difference between @EventPattern() and @MessagePattern() in NestJS microservices?ExpertHigh 20How do you implement the Saga pattern for distributed transactions across NestJS microservices?ExpertHigh 21How do you implement idempotent event handlers to safely handle duplicate message delivery in NestJS?ExpertHigh 22How do you implement event sourcing with NestJS microservices?ExpertHigh 23How do you implement retry logic with exponential backoff for failed microservice calls in NestJS?ExpertHigh 24How do you test a NestJS microservice controller in isolation without a real message broker?ExpertHigh 25How do you implement service discovery and load balancing across NestJS microservice instances?ExpertHigh

All Topics

1

Dependency Injection

2

Request Lifecycle

Exception Handling

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4

Database and ORM

5

Authentication and Authorization