NestJS - Interceptors
You want to create a LoggingInterceptor that logs request duration only if it exceeds 500ms. How would you implement this?
You want to create a LoggingInterceptor that logs request duration only if it exceeds 500ms. How would you implement this?
hard📝 Workflow Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Measure request duration inside intercept
Record start time before next.handle(), calculate duration in tap.Step 2: Add condition to log only if duration exceeds 500ms
Use if statement inside tap to log selectively.Final Answer:
Inside tap, check if duration > 500ms before logging -> Option AQuick Check:
Conditional logging done inside tap operator [OK]
Quick Trick: Use conditional inside tap to log selectively [OK]
Common Mistakes:
- Using guards for timing logic
- Applying timeout incorrectly
- Logging all requests without filtering
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