```ruby
class ApplicationController < ActionController::API
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  # protect_from_forgery with: :exception
  include ActionController::Serialization
end
```

Add response to json objs
user
```ruby
class ApplicationController < ActionController::API
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  # protect_from_forgery with: :exception
  include ActionController::Serialization

  respond_to :json
end
```
assistant