Catch-everything Filter

A catch-everything filter in NestJS is an exception filter declared with @Catch() (empty parameter list) that handles all unhandled exceptions regardless of type. It uses HttpAdapterHost for platform-agnostic response delivery:

@Catch()
export class CatchEverythingFilter implements ExceptionFilter {
  constructor(private readonly httpAdapterHost: HttpAdapterHost) {}
  catch(exception: unknown, host: ArgumentsHost) {
    const { httpAdapter } = this.httpAdapterHost;
    const ctx = host.switchToHttp();
    const status = exception instanceof HttpException
      ? exception.getStatus()
      : HttpStatus.INTERNAL_SERVER_ERROR;
    httpAdapter.reply(ctx.getResponse(), { statusCode: status, ... }, status);
  }
}

When combining with type-specific filters, the catch-everything filter must be declared first to let specific filters handle their bound types correctly.