add json sign in for native app

app/controllers/sessions_controller.rb

@@ -3,6 +3,11 @@
 class SessionsController < Devise::SessionsController
   before_action :configure_permitted_parameters
 
+  skip_before_action :verify_authenticity_token, if: -> { request.xhr? && request.format.json? }
+
+  respond_to :html
+  respond_to :json, only: :create
+
   around_action :with_browser_locale
 
   def create
@@ -11,12 +16,26 @@ class SessionsController < Devise::SessionsController
     if Docuseal.multitenant? && !User.exists?(email:)
       Rollbar.warning('Sign in new user') if defined?(Rollbar)
 
-      return redirect_to new_registration_path(sign_up: true, user: sign_in_params.slice(:email)),
-                         notice: I18n.t('create_a_new_account')
+      respond_to do |format|
+        format.html do
+          redirect_to new_registration_path(sign_up: true, user: sign_in_params.slice(:email)),
+                      notice: t('create_a_new_account')
+        end
+        format.json do
+          render json: { sign_up: true, notice: t('create_a_new_account') }, status: :unprocessable_content
+        end
+      end
+
+      return
     end
 
     if User.exists?(email:, otp_required_for_login: true) && sign_in_params[:otp_attempt].blank?
-      return render :otp, locals: { resource: User.new(sign_in_params) }, status: :unprocessable_content
+      respond_to do |format|
+        format.html { render :otp, locals: { resource: User.new(sign_in_params) }, status: :unprocessable_content }
+        format.json { render json: { otp_required: true, email_otp: false }, status: :unprocessable_content }
+      end
+
+      return
     end
 
     super