You want to accept a query parameter count that must be an integer greater than zero. Which combination correctly uses ParseIntPipe with validation in NestJS?
hard📝 Application Q8 of 15
NestJS - Pipes
You want to accept a query parameter count that must be an integer greater than zero. Which combination correctly uses ParseIntPipe with validation in NestJS?
A@Query('count', ParseIntPipe) count: number; if (count <= 0) throw new Error()
B@Query('count', new ParseIntPipe({ min: 1 })) count: number
C@Query('count', ParseBoolPipe) count: boolean
D@Query('count') count: string
Step-by-Step Solution
Solution:
Step 1: Use ParseIntPipe with options for validation
ParseIntPipe accepts options like min to enforce minimum value during parsing.
Step 2: Identify correct syntax for min validation
Using new ParseIntPipe({ min: 1 }) ensures count is parsed and validated to be at least 1.
Final Answer:
@Query('count', new ParseIntPipe({ min: 1 })) count: number -> Option B
Quick Check:
ParseIntPipe supports min option for validation [OK]
Quick Trick:Use ParseIntPipe with options for min/max validation [OK]
Common Mistakes:
Manually validating after pipe
Using ParseBoolPipe for numbers
Not validating count at all
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