NestJS createParamDecorator return undefined

user_1991252 0
Viewed 2322

I'm using Nest version ^6.7.2

I'm trying to create a createParamDecorator that gets the req.user value from a request.

Inside the createParamDecorator, the req.user has a value, however when I try to get the value in a controller by using the decorator the value is undefined.

const AuthSession = createParamDecorator((data, req) => {
  console.log(req.user); // session data
  return req.user;
});

Controller()
export default class AuthController {
  @Get("/token/ping")
  @UseGuards(AuthGuard("jwt"))
  tokenPing(@AuthSession() session: Session) {
    console.log(session); // undefined
    return session;
  }
}

Edit: I just tried updating to nestjs v7 and I'm having the same issue

import { createParamDecorator, ExecutionContext } from "@nestjs/common";

const AuthSession = createParamDecorator((data: any, ctx: ExecutionContext) => {
  return { message: "asdf" };
});

export default AuthSession;

@Controller()
export default class AuthController {
  @Get("/token/ping")
  @UseGuards(AuthGuard("jwt"))
  tokenPing(@AuthSession() session: Session) {
    console.log(session); // undefined
    return session;
  }
}
nestjs typescript node.js javascript
2 Answers

you can get the information firs from ExecutionContext:

    import { createParamDecorator, ExecutionContext } from '@nestjs/common';

export const User = createParamDecorator(
  (data: unknown, ctx: ExecutionContext) => {
    const request = ctx.switchToHttp().getRequest();
    return request.user;
  },
);

check the example in the doc : Custom decorator

user_135577160

I figured out what the issue was. I had a custom validation PipeTransform that returned undefined if the ArgumentMetadata.type was neither "body" nor "param". So now I just return the first argument of the validator's transform method (the input) if the ArgumentMetadata.type is neither "body" nor "param" and that fixed the problem.

user_19912520
Related