NestJS - Interceptors
Identify the error in this Exception Mapping Interceptor code:
```typescript
intercept(context, next) {
next.handle().pipe(
catchError(err => {
return throwError(() => new Error('Mapped error'));
}),
);
}
```
Identify the error in this Exception Mapping Interceptor code: ```typescript intercept(context, next) { next.handle().pipe( catchError(err => { return throwError(() => new Error('Mapped error')); }), ); } ```
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Check intercept method return
intercept must return the observable chain from next.handle().pipe(...)Step 2: Identify missing return statement
Code calls next.handle().pipe(...) but does not return it, breaking the interceptor chain.Final Answer:
The observable returned by next.handle() is not returned from intercept method -> Option BQuick Check:
Return observable chain in intercept method [OK]
Quick Trick: Always return next.handle().pipe(...) in intercept [OK]
Common Mistakes:
- Forgetting to return the observable
- Misusing catchError syntax
- Thinking throwError is invalid here
Master "Interceptors" in NestJS
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