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Core Architecture

Module Controller Provider service Dependency injection Custom provider token Global module Lifecycle hooks Configuration module

Request Pipeline

Route parameters Query parameters Request body DTO ValidationPipe Custom pipe Guard Interceptor Exception filter

Data and Messaging

TypeORM repository Prisma service integration Mongoose model Transactions service pattern EventEmitter WebSocket gateway Microservice message pattern Cron scheduling

API Production

REST versioning Swagger decorators CORS configuration Helmet middleware Rate limiting File upload interceptor JWT auth guard Testing module

NestJS / Core Architecture

Lifecycle hooks

Learn Lifecycle hooks in NestJS through a focused explanation, a topic-specific example, an engineering warning, and a mastery check.

12 min read • Beginner

nestjs-007.ts

typescript

export class CacheService implements OnModuleInit { onModuleInit(){ console.log("warm cache"); } }

What to watch

Content source & attribution

Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

Lifecycle hooks Mastery Check →

Configuration module