[Solved] Given this JwtStrategy validate method: async validate(payload: any) { return { userId: payload.... } What will be the returned object if the token payload is { sub: 10, username: 'alice' }? | NestJS

NestJS - Authentication

Given this JwtStrategy validate method:

async validate(payload: any) {
  return { userId: payload.sub, username: payload.username };
}

What will be the returned object if the token payload is { sub: 10, username: 'alice' }?

Aundefined

B{ userId: 'alice', username: 10 }

C{ sub: 10, username: 'alice' }

D{ userId: 10, username: 'alice' }

Step-by-Step Solution

Solution:

Step 1: Analyze the validate method return
The method returns an object with userId set to payload.sub and username from payload.username.
Step 2: Substitute payload values
Given payload.sub = 10 and payload.username = 'alice', the returned object is { userId: 10, username: 'alice' }.
Final Answer:
{ userId: 10, username: 'alice' } -> Option D
Quick Check:
Payload mapping = Correct object [OK]

Quick Trick: Map payload.sub to userId in validate() [OK]

Common Mistakes:

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