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When ValidationPipe is set up globally in a NestJS app, what is its primary effect on incoming requests?

easy📝 Conceptual Q1 of 15
NestJS - Pipes
When ValidationPipe is set up globally in a NestJS app, what is its primary effect on incoming requests?
AIt disables validation for all routes to improve performance.
BIt only logs validation errors without blocking requests.
CIt validates and optionally transforms all incoming request data according to DTO rules.
DIt automatically caches validated data for faster responses.
Step-by-Step Solution
Solution:

  1. Step 1: Understand global pipes

    Global pipes apply to every route handler, affecting all incoming requests.

  2. Step 2: Role of ValidationPipe

    ValidationPipe validates input data against DTOs and can transform data types if configured.

  3. Final Answer:

    It validates and optionally transforms all incoming request data according to DTO rules. -> Option C

  4. Quick Check:

    Global ValidationPipe validates and transforms inputs [OK]
Quick Trick: Global ValidationPipe validates and transforms all inputs [OK]
Common Mistakes:
  • Thinking ValidationPipe only logs errors without blocking.
  • Assuming global ValidationPipe disables validation.
  • Believing it caches data automatically.

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