nestjs-patterns

Production-grade NestJS patterns for modular TypeScript backends. - Building NestJS APIs or services - Structuring modules, controllers, and providers - Adding DTO validation, guards, interceptors, or exception filters - Configuring environment-aware settings and database integrations - Testing NestJS units or HTTP endpoints - Keep domain code inside feature modules. - Put cross-cutting filters, decorators, guards, and interceptors in common/ . - Keep DTOs close to the module that owns them. - Always enable whitelist and forbidNonWhitelisted on public APIs. - Prefer one global validation pipe instead of repeating validation config per route. - Controllers should stay thin: parse HTTP input, call a provider, return response DTOs. - Put business logic in injectable services, not controllers.