# API Mode

By default Doorkeeper uses full Rails stack to provide all the OAuth 2 functionality with additional features like administration area for managing applications. By the way, starting from Doorkeeper 5 you can use API mode for your [API only Rails 5 applications](http://edgeguides.rubyonrails.org/api_app.html). All you need is just to configure the gem to work in desired mode:

{% code title="config/initializers/doorkeeper.rb" %}

```ruby
Doorkeeper.configure do
  api_only
  base_controller 'ActionController::API'
end
```

{% endcode %}

Keep in mind, that in this mode you will not be able to access `Applications` or `Authorized Applications` controllers because they will be skipped. CSRF protections (which are otherwise enabled) will be skipped, and all the redirects will be returned as JSON response with corresponding locations.

In order to add Applications for authorizing, you will need to create them via console:

```ruby
Doorkeeper::Application.create(name: "MyApp", redirect_uri: "urn:ietf:wg:oauth:2.0:oob", scopes: ["read", "write"])
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://doorkeeper.gitbook.io/guides/ruby-on-rails/api-mode.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.