NestJS - Pipes
You want to apply a custom pipe that trims whitespace from all string inputs in a controller and also validate numbers globally. Which binding strategy is best to achieve this cleanly?
You want to apply a custom pipe that trims whitespace from all string inputs in a controller and also validate numbers globally. Which binding strategy is best to achieve this cleanly?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand scope of pipes for separation of concerns
Trimming strings is specific to this controller's inputs, so controller-level binding keeps it scoped and clean.Step 2: Apply number validation globally
Number validation is common across the app, so global binding ensures consistent validation everywhere.Final Answer:
Bind the trim pipe at controller level and the number validation pipe globally -> Option AQuick Check:
Controller pipe for specific, global pipe for common validation [OK]
Quick Trick: Use controller pipes for specific, global pipes for common tasks [OK]
Common Mistakes:
- Binding all pipes globally causing unnecessary processing
- Binding all pipes only on parameters causing repetition
- Mixing global and method-level without clear reason
Master "Pipes" in NestJS
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