Filter chain halted as :validate_sign_up_params rendered or redirected

Question

I am installing Devise to deploy Login function on Rails API as backend.

I tried to post API request by Postman but gets the following error.

[Error Message] Unpermitted parameter: :format Filter chain halted as :validate_sign_up_params rendered or redirected

・Request (Postman)： POST "http://localhost:3000/api/v1/auth"

・json { "username": "hogehoge", "email": "hogehoge@example.com", "password": "123456789" }

---

app / controllers / v1 / auth / registrations_controller.rb 
   module Api
      module V1
        module Auth
          class RegistrationsController < DeviseTokenAuth::RegistrationsController
            private
            def sign_up_params
              params.permit(:username, :email, :password)
            end
            def account_update_params
              params.permit(:username, :email)
            end
    
          end
        end
      end
    end

Answer 1

On Postman, the format of sending data was just "Text", but changed to "JSON" like above, then the problem solved!

Answer 2

You should add password_confirmation parameter to your request.