Passport & JWT Basics

Preview — 3 of 10 questions

What is the role of PassportModule in a NestJS application?

javascript

import { Module } from '@nestjs/common';
import { PassportModule } from '@nestjs/passport';

@Module({
  imports: [PassportModule],
})
export class AuthModule {}

AIt encrypts the database connection

BIt integrates the Passport.js authentication library so strategies and guards work within Nest's DI

CIt generates JWT tokens directly

DIt configures CORS

What does @UseGuards(AuthGuard('local')) do on a login route?

javascript

import { Controller, Post, UseGuards, Request } from '@nestjs/common';
import { AuthGuard } from '@nestjs/passport';

@Controller('auth')
export class AuthController {
  @UseGuards(AuthGuard('local'))
  @Post('login')
  login(@Request() req): unknown {
    return req.user; // populated by the local strategy
  }
}

AIssues a JWT automatically

BEncrypts the request body

CSkips authentication entirely

DTriggers the registered local strategy to validate username/password before the handler runs

What does JwtModule.register({ secret, signOptions }) configure?

javascript

import { Module } from '@nestjs/common';
import { JwtModule } from '@nestjs/jwt';

@Module({
  imports: [
    JwtModule.register({
      secret: 'dev-secret',
      signOptions: { expiresIn: '15m' },
    }),
  ],
})
export class AuthModule {}

AThe signing secret and default options (like expiresIn) used by JwtService

BThe database schema for users

CThe CORS origins allowed

DThe Passport strategy name

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