# Milestone 17: REST API Architecture

## Objective

Finalize REST API consistency across all modules.

## Backend Deliverables

- Route catalog.
- Request DTO standards.
- Response DTO standards.
- Pagination standard.
- Filtering and sorting standard.
- Error response standard.
- API versioning strategy.

## Completion Criteria

- All modules follow consistent route, validation, response, and error patterns.
- API documentation is ready for frontend integration.

## Implementation Notes

- REST standards are documented in `backend/docs/rest-api-architecture.md`.
- Swagger/OpenAPI is maintained in `backend/src/docs/openapi.ts` and includes the current module route catalog, including calendar and availability endpoints.
- Shared response and error envelopes are enforced through controllers and `errorHandler`.