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typescriptauthenticationnestjspassport.js

ERROR [ExceptionHandler] Cannot read property '__guards__' of undefined in NestJs

I'm working on implementing a simple authentication in a Nest project.

When I add

@UseGuards(AuthGuard('local'))

to my controller I have the following Error :

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

I followed all the Nest official documentation to do this.

My controller is

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

and my auth.guard.ts

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

  • I'd say this is a dependency version mismatch issue.

    You need to ensure that @nestjs/platform-express, @nestjs/core and @nestjs/common are in the same version (I believe that only the minor slice matters).