[Solved] Given this NestJS controller snippet, what will be the output when a logged-in user accesses /profile? import { Controller, Get, Req } from '@nestjs/common';... | NestJS

NestJS - Authentication

Given this NestJS controller snippet, what will be the output when a logged-in user accesses /profile?

import { Controller, Get, Req } from '@nestjs/common';

@Controller()
export class AppController {
  @Get('profile')
  getProfile(@Req() req) {
    if (req.session.user) {
      return `Hello, ${req.session.user.name}`;
    } else {
      return 'Not logged in';
    }
  }
}

A"Hello, undefined" if user exists but name is missing

B"Not logged in" always

CThrows an error because req.session is undefined

D"Hello, Alice" if req.session.user.name is 'Alice'

Step-by-Step Solution

Solution:

Step 1: Check session user existence
The code checks if req.session.user exists to decide output.
Step 2: Understand output when user exists
If user exists with name 'Alice', it returns "Hello, Alice" string.
Final Answer:
"Hello, Alice" if req.session.user.name is 'Alice' -> Option D
Quick Check:
Session user present returns greeting = A [OK]

Quick Trick: If session user exists, greet by name; else say not logged in [OK]

Common Mistakes:

Assuming req.session is always undefined
Ignoring the user existence check
Confusing output strings

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More NestJS Quizzes

Given this NestJS controller snippet, what will be the output when a logged-in user accesses /profile?

Step 1: Check session user existence

Step 2: Understand output when user exists

Final Answer:

Quick Check:

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