NestJS - Pipes
Which of the following is the correct way to apply a file validation pipe to a file upload in a NestJS controller?
Which of the following is the correct way to apply a file validation pipe to a file upload in a NestJS controller?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the correct decorator for validation pipes
In NestJS, validation pipes are applied using the@UsePipes()decorator.Step 2: Match the usage with file upload
TheFileValidationPipeis a pipe, so it must be passed inside@UsePipes()to validate the uploaded file.Final Answer:
@UsePipes(new FileValidationPipe()) uploadFile(@UploadedFile() file: Express.Multer.File) {} -> Option AQuick Check:
Validation pipe = @UsePipes() [OK]
Quick Trick: Use @UsePipes() for validation pipes, not guards or filters [OK]
Common Mistakes:
- Using @UseGuards or @UseFilters instead of @UsePipes
- Applying pipes without instantiating them
- Confusing interceptors with pipes
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