@Injectable()
export class RefreshTokenGuard extends AuthGuard('jwt-refresh') {}

           @Injectable()
            export class RefreshTokenStrategy extends PassportStrategy(
	            Strategy,
	            'jwt-refresh',
              ) {
	            constructor() {
	              super({
		            jwtFromRequest: ExtractJwt.fromBodyField('refresh_token'),
		            ignoreExpiration: false,
		            secretOrKey: `${process.env.jwt_secret}`,
	              });
	            }
  
	async validate(payload: any) {
	  return { user: payload.sub, username: payload.username };
	}
}

 @UseGuards(RefreshTokenGuard)
            @Get('refresh')
            async refresh(@Request() request) {
              return this.authService.refreshToken(request.user);
              
            }

import { Injectable } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { PassportStrategy } from '@nestjs/passport';
import { ExtractJwt, Strategy } from 'passport-jwt';

@Injectable()
export class RefreshJwtStrategy extends PassportStrategy(
  Strategy,
  'jwt-refresh',
) {
  constructor(private readonly configService: ConfigService) {
    super({
      jwtFromRequest: ExtractJwt.fromBodyField('refresh'),
      ignoreExpiration: false,
      secretOrKey: configService.get<string>('jwt.refreshSecret'),
    });
  }

  async validate(payload: any) {
    return { user: payload.sub, userId: payload.userId };
  }
}

@UseGuards(RefreshJwtGuard)
@Post('/refresh')
 async refreshToken(@Request() req) {
    return await this.authService.refreshToken(req.user);
  }

async refreshToken(user: User) {
    console.log(user); //It is working fine and I can see the object and it's values
    const payload = {
      userId: user.id, //undefined
      sub: {
        id: user.id, //undefined
        username: user.username, //undefined
        email: user.email, //undefined
      },
    };
    console.log(payload); //the payload is showing as {}
    return {
      accessToken: this.jwtService.sign(payload),
    };
  }