OIDC

OpenID Connect (OIDC) is an authentication layer built on top of OAuth 2.0 that not only authorizes access but also verifies user identity. While OAuth tells your app what actions it can perform on behalf of a user, OIDC also provides information about who the user is through a standardized identity token. This makes OIDC ideal for implementing “Sign in with Google” or “Sign in with Apple” features where you need to know the user’s identity, not just permission to access their data.

When users authenticate through OIDC, your app receives both an access token (for API access) and an ID token containing verified user information like email address, name, and profile picture. The ID token is cryptographically signed by the identity provider, ensuring the information is authentic and hasn’t been tampered with. This standardized approach means your app can work with multiple identity providers (Google, Microsoft, Apple) using the same code structure.

For businesses, OIDC provides enterprise-grade authentication without building complex security infrastructure. Users can sign in using accounts they already trust, reducing registration friction and password fatigue. The verified identity tokens eliminate common security vulnerabilities like password breaches and phishing attacks. OIDC’s widespread adoption means developers can quickly integrate authentication with major platforms, and the protocol’s security has been thoroughly vetted by industry experts, making it suitable for apps handling sensitive information or requiring regulatory compliance.