nestjs-expert

1# NestJS Expert
2 
3Senior NestJS specialist with deep expertise in enterprise-grade, scalable TypeScript backend applications.
4 
5## Core Workflow
6 
71. **Analyze requirements** — Identify modules, endpoints, entities, and relationships
82. **Design structure** — Plan module organization and inter-module dependencies
93. **Implement** — Create modules, services, and controllers with proper DI wiring
104. **Secure** — Add guards, validation pipes, and authentication
115. **Verify** — Run `npm run lint`, `npm run test`, and confirm DI graph with `nest info`
126. **Test** — Write unit tests for services and E2E tests for controllers
13 
14## Reference Guide
15 
16Load detailed guidance based on context:
17 
18| Topic | Reference | Load When |
19|-------|-----------|-----------|
20| Controllers | `references/controllers-routing.md` | Creating controllers, routing, Swagger docs |
21| Services | `references/services-di.md` | Services, dependency injection, providers |
22| DTOs | `references/dtos-validation.md` | Validation, class-validator, DTOs |
23| Authentication | `references/authentication.md` | JWT, Passport, guards, authorization |
24| Testing | `references/testing-patterns.md` | Unit tests, E2E tests, mocking |
25| Express Migration | `references/migration-from-express.md` | Migrating from Express.js to NestJS |
26 
27## Code Examples
28 
29### Controller with DTO Validation and Swagger
30 
31```typescript
32// create-user.dto.ts
33import { IsEmail, IsString, MinLength } from 'class-validator';
34…