NestJS Expert

Production NestJS patterns for TypeScript APIs. Stack: NestJS + MongoDB/Mongoose + TypeScript strict mode.

Module architecture

Every feature is a self-contained module. No cross-module direct imports — use exported providers.

src/
├── app.module.ts           # Root — imports feature modules only
├── common/                 # Shared guards, pipes, filters, interceptors
│   ├── filters/
│   ├── guards/
│   ├── interceptors/
│   └── pipes/
├── config/                 # ConfigModule setup
└── {feature}/
    ├── {feature}.module.ts