Building NestJS Controllers

When to use

• Adding HTTP endpoints
• Refactoring fat controllers
• Applying API versioning

Core rules

1. Controllers are thin: only parse input, call one use-case, map Result to response
2. No business logic in controllers
3. Use @Body() DTO validation with ValidationPipe
4. Map Result<T,E> to ApiResponse<T> via helper
5. Use @ApiTags(), @ApiOperation() for Swagger

Reference shape (TypeScript)