An issue occurred in NestJs where it was unable to access the property '__guards__' because it was undefined

Currently, I am in the process of incorporating a basic authentication system into my Nest project.

After including the following line in my controller:

@UseGuards(AuthGuard('local'))

I encountered this error message:

ERROR [ExceptionHandler] Cannot read property '__guards__' of undefined
 at /home/cedric/Bureau/programmation/project_bank/project/node_modules/@nestjs/core/scanner.js:147:152

Despite closely following the official documentation provided by Nest, this issue persists.

This is what my controller looks like:

  @UseGuards(AuthGuard('local'))
  @Post('login')
  async login(@Request() req) {
    console.log(req.body.username);
    return req.body.username;
  }

As for my auth.guard.ts file:

@Injectable()
export class LocalAuthGuard extends AuthGuard('local') {}

Answer №1

It seems like the problem here is a mismatch in dependency versions.

To resolve this, make sure that @nestjs/platform-express, @nestjs/core, and @nestjs/common are all on the same version (typically only the minor version matters).

Answer №2

It turned out that the issue was caused by a mismatch in dependency versions.

To fix this problem, I followed these steps to update my project:

  1. First, I installed ncu from the npm-check-updates library:
sudo npm install -g npm-check-updates
  1. Next, I ran ncu in the project folder:
ncu
  1. Then, I updated my dependencies:
ncu -u
  1. Finally, I installed the updates:
npm install

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