NestJs Global HttpExceptionFilter not working properly

Question

Hello I'm trying to create a RestFul application using NestJs and I'm trying to create a global exception filter.

Basically I have to 2 endpoints.

/api/user/register
/api/auth/token

Each endpoint throws a different exception but I can't seem to get it working. It doesn't go through my ExceptionFilter class. Did I miss something?

I would really appreciate if someone can help me with this.

Thanks a lot.

AuthModule.ts

@Module({
  imports: [
    MongooseModule.forFeature([
      {
        name: 'AuthClient',
        schema: AuthClientSchema,
      }
    ]),
  ],
  controllers: [AuthController],
  providers: [
    AuthService,
  ],
})
export class AuthModule { }

UserModule.ts

@Module({
  imports: [
    MongooseModule.forFeature([
      {
        name: 'User',
        schema: UserSchema,
      }
    ]),
  ],
  controllers: [UserController],
  providers: [UserService],
})
export class UserModule { }

AppModule.ts

@Module({
  imports: [
    DatabaseModule,
    AuthModule,
    UserModule,
  ],
  providers: [
    {
      provide: APP_FILTER,
      useClass: HttpExceptionFilter,
    }
  ],
})
export class AppModule { }

Controller.ts

export class UserController {
  @Post('register')
  public register(@Body() registerDto: RegisterDto, @Res() res: Response): void {
     return this.userService.create(registerDto);
  }
}

export class AuthController {
  @Post('auth')
  public createToken(@Body() authDto: AuthDto, @Res() res: Response): void {
    this.authService.findByUsername(authDto).then((data) => {
     .....
    })
  }
}

Providers.ts

@Injectable()
export class AuthService {
  async findByUsername(authDto: AuthDto) {
    throw new HttpException('Opps something went wrong', 500);
  }
}

@Injectable()
export class UserService {
  async create(registerDto: RegisterDto) {
    throw new HttpException('Unable to create', 500);
  }
}

HttpExceptionFilter.ts

@Catch(HttpException)
export class HttpExceptionFilter extends BaseExceptionFilter {
  catch(exception: HttpException, host: ArgumentsHost): void {

    console.log('<<<<<<>>>>>>>>>>>>>>>>>', exception)
  }
}

main.ts

async function bootstrap() {
  const app = await NestFactory.create(AppModule);

  app.setGlobalPrefix('api');

  await app.listen(3000);
}
bootstrap();

Repo: click here

Gabriel Lupu Gabriel Lupu · Accepted Answer · 2020-04-17T08:55:07

According to their docs there are two ways of injecting global exception filters. You can also try the second method, as presented below for your case:

main.ts

    async function bootstrap() {
      const app = await NestFactory.create(AppModule);

      + const { httpAdapter } = app.get(HttpAdapterHost);
      + app.useGlobalFilters(new HttpExceptionFilter(httpAdapter));

      app.setGlobalPrefix('api');
      await app.listen(3000);
    }

    bootstrap();

NestJs Global HttpExceptionFilter not working properly

2 Answers