NestJS Complete Guide
Build enterprise-grade Node.js applications with NestJS, covering modules, providers, guards, and microservices.
backendAdvanced25 min read
AI Summary
Quick context for NestJS Complete Guide
NestJS Complete Guide is a advanced guide in backend. Build enterprise-grade Node.js applications with NestJS, covering modules, providers, guards, and microservices.. Key topics: backend, enterprise, nestjs, nodejs.
# NestJS Complete Guide
NestJS is a progressive Node.js framework for building efficient, reliable, and scalable server-side applications.
## Architecture
NestJS uses a modular architecture inspired by Angular. Each module encapsulates a bounded context of related functionality.
```typescript
@Module({
imports: [DatabaseModule],
controllers: [UsersController],
providers: [UsersService],
exports: [UsersService],
})
export class UsersModule {}
```
## Providers and Dependency Injection
```typescript
@Injectable()
export class UsersService {
constructor(
@InjectRepository(User)
private readonly userRepo: Repository,
) {}
async findAll(): Promise {
return this.userRepo.find();
}
}
```
## Guards and Interceptors
Guards handle authentication and authorization. Interceptors handle cross-cutting concerns like logging and caching.
```typescript
@Injectable()
export class AuthGuard implements CanActivate {
canActivate(context: ExecutionContext): boolean {
const request = context.switchToHttp().getRequest();
return !!request.user;
}
}
```
## Microservices
NestJS supports various transport layers including TCP, Redis, NATS, and gRPC for building distributed systems.
Continue with related content
Suggested next reads and tools from the knowledge graph.
guiderelates to
Mastering TypeScript
Learn TypeScript from fundamentals to advanced patterns including generics, decorators, and utility types.
languages#typescript#javascript#type-safety
guiderelates to
RESTful API Design Patterns
Design robust and scalable REST APIs with proven patterns for authentication, versioning, and error handling.
backend#api#rest#backend
toolrelates to
Visual Studio Code
A powerful, lightweight source code editor with built-in support for TypeScript, JavaScript, and thousands of extensions.