Base URL & versioning

All endpoints live under /api/v1. The Angular SPA uses the same prefix; the SPA fallback only kicks in for non-API routes.

Path prefix	Purpose
`/api/v1/*`	Versioned JSON REST endpoints.
`/api/docs`	Swagger UI (OpenAPI 3.1).
`/api/docs-json`	Raw OpenAPI 3.1 document.
`/uploads/*`	Static uploads directory (`UPLOAD_DIR`).
`/*`	SPA fallback (`FRONTEND_DIST/index.html`).

Authentication

JwtAuthGuard is registered as APP_GUARD and runs on every request unless the handler is marked with @Public() from backend/src/common/decorators/public.decorator.ts.
Successful auth produces an access JWT in the response body and an HttpOnly refresh cookie named rt (see backend/src/modules/auth/cookie.ts).
Authorization: Bearer <accessToken> is attached by the authInterceptor on the frontend.

CSRF

CsrfMiddleware (registered globally) mints a csrf cookie on every response and, for unsafe methods (POST, PUT, PATCH, DELETE), compares the cookie against the x-csrf-token header using crypto.timingSafeEqual.
The frontend's csrfInterceptor runs before authInterceptor so the header is attached on every unsafe call.
Skip list (SKIP_PATH_PREFIXES in backend/src/common/middleware/csrf.middleware.ts):
- /api/v1/auth/register-first-admin
- /api/v1/setup/create-admin
- /api/v1/auth/login is no longer skipped — the middleware still mints the cookie on the first response, and the SPA's AuthService.login/AuthService.register first call GET /api/v1/auth/csrf via ensureCsrf() to materialise the cookie before submitting.

Error envelope

Every error flows through GlobalExceptionFilter and is shaped as:

{
  "code": "USERNAME_TAKEN",
  "message": "Username already exists",
  "details": null,
  "path": "/api/v1/setup/create-admin",
  "timestamp": "2026-07-21T14:43:00.000Z"
}

Field	Type	Notes
`code`	string	One of `ERROR_CODES` (`backend/src/common/errors/error-codes.ts`).
`message`	string	Human-readable summary.
`details`	unknown \| null	Optional structured details (e.g. zod field errors).
`path`	string	Original request path.
`timestamp`	ISO 8601 string	When the filter produced the response.

Canonical error codes

USERNAME_TAKEN is the most recently added code (used by the setup endpoint). Full list lives in backend/src/common/errors/error-codes.ts:

VALIDATION_FAILED, UNAUTHORIZED, FORBIDDEN, NOT_FOUND, CONFLICT, LAST_ADMIN, SYSTEM_INITIALIZED, RATE_LIMITED, CSRF_INVALID, WEAK_PASSWORD, USERNAME_TAKEN, INVALID_CREDENTIALS, TOKEN_REVOKED, THEME_INVALID, REGISTRATIONS_DISABLED, INVALID_OLD_PASSWORD, PASSWORD_POLICY, PASSWORDS_DO_NOT_MATCH, CATEGORY_HAS_CHALLENGES, SYSTEM_PROTECTED, CHALLENGE_NAME_TAKEN, CHALLENGE_INVALID_CATEGORY, CHALLENGE_INVALID_POINTS, CHALLENGE_INVALID_PORT, CHALLENGE_INVALID_IP, CHALLENGE_FILE_LIMIT, IMPORT_VALIDATION_FAILED, IMPORT_PARTIAL_FAILURE, EVENT_NOT_RUNNING, FLAG_INCORRECT, CHALLENGE_DISABLED, INTERNAL.

The player-facing codes (EVENT_NOT_RUNNING, FLAG_INCORRECT) are emitted by the challenges submit endpoint; see Challenges Endpoints for the full set of HTTP statuses and the canonical messages produced by messageForSolveError.

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Base URL & versioning

Authentication

CSRF

Error envelope

Canonical error codes

See also

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