rendering all controller actions with json

app/controllers/application_controller.rb

@@ -2,6 +2,8 @@ class ApplicationController < ActionController::API
   include DeviseTokenAuth::Concerns::SetUserByToken
   include Pundit
 
+  respond_to :json
+
   # Prevent CSRF attacks by raising an exception.
   # For APIs, you may want to use :null_session instead.
   # protect_from_forgery with: :null_session