# API File Structure (Strict)

This document defines the canonical **physical** structure for `apps/api/**`.

It describes where code lives, not the full behavioral rules.

## 1) API is feature-based

The API is organized by feature modules.

```text
apps/api/
  src/
    domain/
    shared/
```

Within feature modules:

```text
apps/api/src/domain/<feature>/
  <Feature>Controller.ts
  <Feature>Service.ts
  <Feature>Module.ts
  dto/
  presenters/
```

## 2) What belongs where (strict)

- Controllers: HTTP boundary only
- DTOs: HTTP contracts only
- Presenters: map Core results  response DTOs

API flow rules:

- [`docs/architecture/api/API_DATA_FLOW.md`](docs/architecture/api/API_DATA_FLOW.md:1)