# API Reference

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The API reference is split by responsibility so each source file stays focused and easy to review.

## Sections

- [Authentication and sessions](api/authentication.md) - session cookies, API tokens, and session lifetime.
- [Endpoints](api/endpoints.md) - public routes, protected routes, multi-account routes, information routes, diagnostics, and OAuth routes.
- [Middleware](api/middleware.md) - `sessVal`, `roleChk`, strict session helpers, render helpers, and token authentication.
- [Code examples](api/examples.md) - Express integration, role checks, API auth, client login/logout, database access, and error handling.
- [Operational reference](api/operations.md) - HTTP status codes, security best practices, and rate limits.

## Related Reference

- [Error codes](error-codes.md)
- [Database guide](../guides/database.md)
- [Configuration guide](../guides/configuration.md)