[Solved] What is wrong with this guard usage?@UseGuards() export class AppController { @Get('data') getData() { return 'data'; } } | NestJS

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What is wrong with this guard usage?

@UseGuards() export class AppController { @Get('data') getData() { return 'data'; } }

AMissing @Controller decorator on class

B@UseGuards() cannot be used on classes

C@UseGuards() requires at least one guard class as argument

DgetData method must be async

Step-by-Step Solution

Solution:

Step 1: Check @UseGuards() usage
@UseGuards() must receive one or more guard classes; empty parentheses are invalid.
Step 2: Verify other options
@UseGuards() can be used on classes, @Controller may be missing but not asked, method async not required.
Final Answer:
@UseGuards() requires at least one guard class as argument -> Option C
Quick Check:
@UseGuards() needs guard classes [OK]

Quick Trick: Always pass guard classes to @UseGuards() [OK]

Common Mistakes:

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What is wrong with this guard usage?