NestJS / FastAPI

Structured APIs

NestJS (Node) and FastAPI (Python) are frameworks for robust APIs.

NestJS (TypeScript)

npm i -g @nestjs/cli
nest new my-api
cd my-api
npm run start:dev

NestJS Structure

src/
├── app.module.ts
├── users/
│   ├── users.controller.ts  # Endpoints
│   ├── users.service.ts     # Logic
│   ├── users.module.ts      # Registration
│   └── dto/                 # Validation

Controller

@Controller('users')
export class UsersController {
  constructor(private usersService: UsersService) {}

  @Get()
  findAll() {
    return this.usersService.findAll()
  }

  @Post()
  create(@Body() createUserDto: CreateUserDto) {
    return this.usersService.create(createUserDto)
  }
}

FastAPI (Python)

We saw it in the Cook level. Comparison:

When to use each

• NestJS: Large teams, microservices
• FastAPI: AI/ML, fast prototypes