NestJS can't resolve dependencies of the JWT_MODULE_OPTIONS

Question

I\'m failed to compile with this error:

Nest can\'t resolve dependencies of the JWT_MODULE_OPTIONS (?). Please make sure that the argument at index [0] is available

Answer 1

You can make a separate module for it (SharedModule)

make sure you have the following packages installed

npm i --save @nestjs/jwt
npm i --save @nestjs/passport

(optional, if you go with MongoDB/Mongoose)

  npm i --save @nestjs/mongoose 

shared.module.ts

@NgModule({
   imports: [
      PassportModule.register({
          defaultStrategy: 'jwt',
        }),
        JwtModule.register({
          secret: process.env.JWT_SECRET_KEY,
          signOptions: {
            expiresIn: '2 days',
          },
        }),
    
   ],
   providers: [JwtStrategy],
   exports: [JwtStrategy, PassportModule]
})

jwt.strategy.ts

@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy) {
  constructor(@InjectModel('User') private collection: Model) {
    super({
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
      secretOrKey: process.env.JWT_SECRET_KEY,
    });
  }

  async validate(payload: JwtPayload): Promise {
    const { username } = payload;
    const user = await this.collection.findOne({ username });

    if (!user) {
      throw new UnauthorizedException('JwtStrategy unauthorized');
    }

    return user;
  }
}

Now where you want to use it, just import in your module SharedModule. In your controllers use the following decorator

@UseGuards(AuthGuard())