[Solved] What is wrong with this interceptor code that tries to transform the response? intercept(context, next) { next.handle().pipe(map(data => data.trim())); } | NestJS

NestJS - Interceptors

What is wrong with this interceptor code that tries to transform the response?

intercept(context, next) {
  next.handle().pipe(map(data => data.trim()));
}

Anext.handle() should not be called

Bmap operator cannot be used inside intercept

Ctrim() is not a valid method on data

DMissing return statement for the observable

Step-by-Step Solution

Solution:

Step 1: Check interceptor return value
Interceptors must return the observable from next.handle().pipe(...).
Step 2: Identify missing return
The code calls next.handle().pipe(...) but does not return it, so the response is undefined.
Final Answer:
Missing return statement for the observable -> Option D
Quick Check:
Always return next.handle().pipe(...) [OK]

Quick Trick: Always return the observable from intercept method [OK]

Common Mistakes:

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What is wrong with this interceptor code that tries to transform the response?