Implement a strictly typed global filter and use `HttpAdapterHost` so it works with Express or Fastify without importing platform-specific request/response types. ```ts @Catch() export class GlobalExceptionFilter implements ExceptionFilter { constructor(private readonly adapterHost: HttpAdapterHost) {} catch(exception: unknown, host: ArgumentsHost) { const { httpAdapter } = this.adapterHost; const ctx = host.switchToHttp(); const status = exception instanceof HttpException ? exception.getStat...
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Implement a strictly typed global filter and use `HttpAdapterHost` so it works with Express or Fastify without importing platform-specific request/response types.
```ts
@Catch()
export class GlobalExceptionFilter implements ExceptionFilter {
constructor(private readonly adapterHost: HttpAdapterHost) {}
catch(exception: unknown, host: ArgumentsHost) {
const { httpAdapter } = this.adapterHost;
const ctx = host.switchToHttp();
const status = exception instanceof HttpException
? exception.getStatus() : HttpStatus.INTERNAL_SERVER_ERROR;
const response = { statusCode: status, message: 'Request failed', error: 'Error',
timestamp: new Date().toISOString(), path: httpAdapter.getRequestUrl(ctx.getRequest()) };
httpAdapter.reply(ctx.getResponse(), response, status);
}
}
app.useGlobalFilters(app.get(GlobalExceptionFilter));
```
Let services throw domain errors, map low-level errors to HTTP exceptions in an interceptor, and let the filter only format/log the final response.
