NestJS - Guards
Given this code snippet, what will happen if a request has an invalid JWT token?
```typescript
@UseGuards(JwtAuthGuard)
@Get('profile')
getProfile() {
return { message: 'Access granted' };
}
```
Given this code snippet, what will happen if a request has an invalid JWT token? ```typescript @UseGuards(JwtAuthGuard) @Get('profile') getProfile() { return { message: 'Access granted' }; } ```
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand JwtAuthGuard behavior on invalid token
JwtAuthGuard denies access and throws 401 Unauthorized if token is invalid.Step 2: Analyze the route behavior with guard
The route handler runs only if guard passes; invalid token blocks access.Final Answer:
The request is denied with 401 Unauthorized error -> Option CQuick Check:
Invalid token = 401 error [OK]
Quick Trick: Invalid JWT causes 401 Unauthorized by default [OK]
Common Mistakes:
- Assuming invalid token lets request pass
- Expecting server crash on invalid token
- Thinking guard redirects automatically
Master "Guards" in NestJS
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