Practice dependency injection, modules, decorators, and enterprise architecture patterns
Start Practicing NowMaster modules, controllers, services, and dependency injection
Understand NestJS decorators and metadata-driven development
Learn microservices, GraphQL, WebSockets, and testing strategies
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Modules, controllers, and services
Dependency injection and providers
Middleware, guards, and interceptors
Pipes and validation
GraphQL and REST API development
Microservices architecture
A: NestJS uses Angular-like DI. Providers registered in module's providers array. Scopes: DEFAULT (singleton, shared across app), REQUEST (new instance per request), TRANSIENT (new instance per injection). Use @Injectable() decorator. Constructor injection recommended. Circular dependencies handled with forwardRef().
A: Guards: control route access (authentication, authorization), return boolean. Interceptors: transform response, bind extra logic, extend functionality (logging, caching). Pipes: transform/validate input data. Execution order: guards → interceptors (before) → pipes → controller → interceptors (after). Each serves distinct purpose in request lifecycle.
A: NestJS supports multiple transport layers: TCP, Redis, NATS, RabbitMQ, Kafka, gRPC. Create microservice with createMicroservice(). Use @MessagePattern() for message handlers. Hybrid apps support HTTP + microservice. Built-in retry logic, error handling. Choose transport based on requirements: gRPC for performance, RabbitMQ for reliability.
A: Modules organize application (@Module decorator). Feature modules, shared modules, global modules (@Global()). Dynamic modules configured at runtime, return DynamicModule interface. Use forRoot() for app-wide config, forFeature() for feature-specific. Example: TypeOrmModule.forRoot(options). Enables flexible, reusable module configuration.
Master decorators: @Controller, @Injectable, @Get, @Post, @Body, @Param
Understand middleware vs guards vs interceptors and when to use each
Know how to integrate TypeORM or Prisma with NestJS
Practice with GraphQL module for building GraphQL APIs
Understand testing in NestJS with Jest and supertest
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