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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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    ory / hydra

    Star 17k

    Internet-scale OpenID Certified™ OpenID Connect and OAuth2.1 provider that integrates with your user management through headless APIs. Solve OIDC/OAuth2 user cases over night. Consume as a service on Ory Network or self-host. Trusted by OpenAI and many others for scale and security. Written in Go.

    docker security identity oauth oauth2 cloud server oauth2-provider authorization hydra sso openid oauth2-server openid-connect oauth-provider openid-provider federation oidc hacktoberfest openid-connect-provider
    • Updated Apr 2, 2026
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    caddy-security

    greenpau / caddy-security

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    🔐 Authentication, Authorization, and Accounting (AAA) App and Plugin for Caddy v2. 💎 Implements Form-Based, Basic, Local, LDAP, OpenID Connect, OAuth 2.0 (Github, Google, Facebook, Okta, etc.), SAML Authentication. MFA/2FA with App Authenticators and Yubico. 💎 Authorization with JWT/PASETO tokens. 🔐

    security ldap jwt saml oauth2 authentication acl auth authorization secops sso openid access-control secdevops websecurity caddy-plugin webauthn paseto paseto-tokens caddy2
    • Updated Apr 3, 2026
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    authorizerdev / authorizer

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    Your data, your control. Fully open source, authentication and authorization. No lock-ins. Deployment in Railway in 120 seconds || Spin a docker image as a micro-service in your infra. Built in login page and Admin panel out of the box.

    graphql docker golang security oauth2 typescript sql authentication microservice nosql auth authorization graphdb role-based-access-control hacktoberfest 2fa social-logins magic-link user-privileges
    • Updated Apr 6, 2026
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    Created by IETF OAuth Working Group

    Released October 2012

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    Website
    github.com/topics/oauth2
    Wikipedia
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    Related topics

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