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OAuth 2.0

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OAuth 2.0 (short for “Open Authorization”) is the industry-standard protocol for authorization. Generally, the OAuth protocol provides a way for resource owners to provide a client [application] with secure delegated access to server resources.

Types

OAuth framework specifies several grant types for different use cases. Some of the most common OAuth grant types are:

  • Authorization Code
  • PKCE
  • Client Credentials
  • Device Code
  • Refresh Token
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    OpenID Connect, the authentication protocol and identity layer on top of OAuth 2.0 used in many SSO and adopted in many social logins (Apple, Facebook, Google, ...etc). Find this curated list of providers, services, libraries, and resources to adopt it and know more about existing specs.

    • Updated Oct 25, 2025
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    Created by IETF OAuth Working Group

    Released October 2012

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    Related topics

    access-token authentication indieauth oauth oidc openid raml refresh-token saml xacml