[Solved] Consider this interceptor code:intercept(context, next) { console.log('Before'); return next.handle().pipe(tap(() => console.log('After'))); }What will be logged when a request is handled? | NestJS

NestJS - Interceptors

Consider this interceptor code:

intercept(context, next) {
  console.log('Before');
  return next.handle().pipe(tap(() => console.log('After')));
}

What will be logged when a request is handled?

AAfter (immediately), then Before (after response)

BBefore (immediately), then After (after response)

COnly Before

DOnly After

Step-by-Step Solution

Solution:

Step 1: Identify synchronous and asynchronous logs
'Before' logs immediately before calling next.handle().
Step 2: Understand tap operator timing
tap logs 'After' when the response stream emits, after the handler completes.
Final Answer:
Before (immediately), then After (after response) -> Option B
Quick Check:
tap logs after response, console before next.handle() [OK]

Quick Trick: console before next.handle() runs immediately [OK]

Common Mistakes:

Master "Interceptors" in NestJS

9 interactive learning modes - each teaches the same concept differently

More NestJS Quizzes

Consider this interceptor code: