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Pass Information from NestJS middlewares to controllers/services

I have applied authentication in NestJS middlewares and decoding all the information from user token by the third party API.

Now I have got the information in my middleware, how can I send that information to controllers and services?

Solution

  • It is normal for middlewares to add information to the request object (eg. adding a user object).

    For a clean way to extract information from the request object and inject it into the controller you can make a custom route decorator

    For example, extracting the user:

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

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

    And then in your controller

    @Get()
async findOne(@User() user: UserEntity) {
  console.log(user);
}

    From there you can just ensure that your service methods receive the User as a regular method parameter