# Best Practices — NestJS

Source: https://www.geekswithgeeks.com/en/nestjs/nestjs-best-practices

> Patterns and conventions for maintainable, scalable code.

## Folder structure & naming

One feature per folder; consistent naming (*.controller.ts, *.service.ts, *.module.ts); group by domain, not by type.

## DTOs & validation

Always use DTOs for input validation; separate create/update DTOs; validate at the boundary (controller).

## Error handling uniformity

Throw HTTP exceptions with clear messages; use a global filter to format responses consistently.