<h2>Overview:</h2>
Doorkeeper is a gem (Rails engine) designed to easily introduce OAuth 2 provider functionality to Ruby on Rails or Grape applications. It supports various OAuth 2.0 features and provides a range of extensions for customization.
<h2>Features:</h2>
<ul>
<li>OAuth 2.0 Authorization Framework</li>
<li>Authorization Code Flow</li>
<li>Access Token Scopes</li>
<li>Refresh token</li>
<li>Implicit grant</li>
<li>Resource Owner Password Credentials</li>
<li>Client Credentials</li>
<li>OAuth 2.0 Token Revocation</li>
<li>OAuth 2.0 Token Introspection</li>
<li>OAuth 2.0 Threat Model and Security Considerations</li>
<li>OAuth 2.0 for Native Apps</li>
<li>Proof Key for Code Exchange by OAuth Public Clients</li>
</ul>

Doorkeeper Gem

Doorkeeper