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nestjs-error-handling

Implement Global Exception Filters and standard error formats in NestJS. Use when implementing global exception filters or standardizing error responses in NestJS.

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SKILL.md (original)

Review the instructions the agent will receive before you install.

NestJS Error Handling Standards

Priority: P1 (HIGH)

  • Requirement: Centralize error formatting.
  • Platform Agnostic: not import Request/Response from Express/Fastify types directly.
  • Use: HttpAdapterHost to access underlying platform response methods.
  • const { httpAdapter } = this.httpAdapterHost;
  • Structure:
  • Implement strictly typed error responses.
  • Refer to API Standards for ApiErrorResponse.
 {
   "statusCode": 400,
   "message": "Validation failed",
   "error": "Bad Request",
   "timestamp": "ISO...",
   "path": "/users"
 }

Error Flow

  1. Service: Throws specific or generic errors (e.g., EntityNotFoundError).
  2. Interceptor: Maps low-level errors to HTTP Exceptions (e.g., catchError(err => throw new NotFoundException())).
  • Why: Keeps Exception Filters focused on formatting, not business logic interpretation.
  1. Global Filter: Formats final JSON response.

Built-in Exceptions

  • Use: Throw NotFoundException, ForbiddenException, BadRequestException.
  • Custom: Extend HttpException only for domain-specific failures that need specific status codes.

Logging

  • Context: Always pass MyClass.name to Logger constructor.
  • Levels:
  • error: 500s (Stack trace required).
  • warn: 400s (Client errors).

Security (Information Leakage)

  • Production: NEVER expose stack traces in HTTP responses (process.env.NODE_ENV === 'production').
  • Sanitization: Ensure ApiException payloads not leak internal file paths or raw variable dumps.

Anti-Patterns

  • No stack traces in production: Gate stack exposure behind NODE_ENV === 'production' check.
  • No Express types in filters: Use HttpAdapterHost for platform-agnostic error handling.
  • No HttpException in services: Throw domain errors in services; let Interceptors map to HTTP exceptions.

Canonical response anchors

  • Additional task-grounded exact anchors: sanitiz

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