How can you enforce that a query parameter active is both required and a boolean using NestJS pipes?

hard📝 Application Q9 of 15

NestJS - Pipes

How can you enforce that a query parameter active is both required and a boolean using NestJS pipes?

AUse <code>@Query('active') active: string</code> and manually check in method

BUse <code>@Query('active', ParseIntPipe) active: boolean</code>

CUse <code>@Query('active', ParseBoolPipe) active?: boolean</code> without validation

Use <code>@Query('active', new ParseBoolPipe({ exceptionFactory: () => new BadRequestException('active is required') })) active: boolean</code>

Step-by-Step Solution

Solution:

Step 1: Use ParseBoolPipe to convert to boolean
This pipe converts string 'true'/'false' to boolean.
Step 2: Make parameter required with custom exception
By providing exceptionFactory, you can throw a custom error if the parameter is missing or invalid.
Final Answer:
Use new ParseBoolPipe({ exceptionFactory: () => new BadRequestException('active is required') }) to enforce required boolean -> Option D
Quick Check:
Custom exception enforces required boolean query param [OK]

Quick Trick: Use ParseBoolPipe with exceptionFactory for required booleans [OK]

Common Mistakes:

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