How can you combine ValidationPipe with custom error messages for a DTO property validation failure?

hard📝 Application Q9 of 15

NestJS - Pipes

How can you combine ValidationPipe with custom error messages for a DTO property validation failure?

AUse class-validator decorators with message option, e.g. <code>@IsInt({ message: 'Age must be an integer' })</code>

BSet <code>ValidationPipe</code> option <code>errorMessage</code> globally

COverride <code>ValidationPipe</code> transform method to throw custom errors

DUse <code>@UseFilters</code> to catch and replace validation errors

Step-by-Step Solution

Solution:

Step 1: Know where to set custom messages
Custom error messages are set in class-validator decorators on DTO properties.
Step 2: Understand ValidationPipe role
ValidationPipe triggers validation but does not define messages; decorators do.
Final Answer:
Use class-validator decorators with message option, e.g. @IsInt({ message: 'Age must be an integer' }) -> Option A
Quick Check:
Custom messages set in decorators, not pipe options [OK]

Quick Trick: Set messages inside class-validator decorators [OK]

Common Mistakes:

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