# Provides Formats

With Padrino you can simply declare which formats a request will respond to by
using the `provides` route configuration:

```ruby
Demo::App.controllers :admin do
  get :show, with: :id, provides: :js do
    # url is generated as "/admin/show/#{params[:id]}.#{params[:format]}"
    # url_for(:admin, :show, id: 5, format: :js) => "/admin/show/5.js"
  end

  get :other, with: [:id, :name], provides: [:html, :json] do
    case content_type
      when :js    then ...
      when :json  then ...
    end
  end
end
```

These formatted route paths can be accessed easily using `url_for` and then
`format` option:

```haml
= link_to 'admin show page', url_for(:admin, show, id: 25, format: :js)
= link_to 'admin other page', url_for(:admin, index, id: 25, name: :foo)
= link_to 'other json', url(:admin, index, id: 25, name: :foo, format: :json)
```