How to return custom status code in nestjs?

Issue

I have my system that has custom errors like this:

import { ExtendableError } from './extandable.error'

export const customError = {
  EMAIL_EXIST: () => new ExtendableError({
    message: 'USER WITH SUCH EMAIL ALREADY EXIST',
    code: 403
  }),

  INVALID_EMAIL: () => new ExtendableError({
    message: 'INVALID EMAIL',
    code: 400
  }),

  INVALID_PASSWORD: () => new ExtendableError({
    message: 'INVALID EMAIL OR PASSWORD',
    code: 403
  }),

  EMAIL_DOES_NOT_EXIST: () => new ExtendableError({
    message: 'EMAIL DOES NOT EXIST',
    code: 404
  }),

  TOKEN_DOES_NOT_EXIST: () => new ExtendableError({
    message: 'TOKEN DOES NOT EXIST',
    code: 404
  }),

  DIFFERENT_PASSWORDS: () => new ExtendableError({
    message: 'PASSWORDS ARE NOT SAME',
    code: 400
  }),

  CURRENT_PASSWORD_ERR0R: () => new ExtendableError({
    message: 'CURRENT PASSWORD IS INCORRECT',
    code: 400
  }),

  SAME_PASSWORDS_ERROR: () => new ExtendableError({
    message: 'CANNOT CHANGE SET NEW PASSWORD AS OLD PASSWORD',
    code: 403
  })
}

Here I can write my own error responses When I request something, and for example emails exists, it throws an error that such email while registration already exists.

It states here:

async createAccount (doc: RegisterDto, verificationLink: string) {
      if (!isValidEmail(doc.email)) {
        return customError.INVALID_EMAIL()
      }

      const user = await this.existByEmail(doc.email)

      if (!user) {
        return customError.EMAIL_EXIST()
      }// HERE I RETURNING AN ERROR TO CONTROLLER
      doc.password = await bcrypt.hash(doc.password, SALT_ROUNDS)
      const created = await this.repository.create(this.registerMapper.toDomain(doc))
      await this.emailService.sendVerificationEmail(created, verificationLink)
      return created
    }

Here is my function in controller:

@Post('/api/register')
    async register(@Body() registerDTO: RegisterDto, @Request() request, @Response() response) {
      const verificationLink = `${request.protocol}://${request.header.host}/api/verify-account/`
      return await this.service.createAccount(registerDTO, verificationLink)
    }

In postman, it shows me the body and the response, but the actual result of the status code has 201 code How can I fix it?

Solution

Instead of return customError.INVALID_EMAIL() you should throw an error. From npm docs:

let ExtendableError = require('extendable-error');

class MyCustomError extends ExtendableError {};

throw new MyCustomError('A custom error ocurred!');

Answered By - Chai