OAuth vs OpenID Connect
OAuth 2.0 provides authorization (access tokens); OpenID Connect adds authentication (ID tokens).
What is OAuth vs OpenID Connect?
OAuth 2.0 vs OpenID Connect (OIDC) is a fundamental comparison in identity architecture.
OAuth 2.0 is an authorization framework - it allows applications to access resources on behalf of a user (like accessing Google Drive files). It issues access tokens (opaque or JWT) that grant scoped permissions.
OpenID Connect is an identity layer built on top of OAuth 2.0 - it adds authentication capabilities by issuing an ID Token (JWT) that contains verified user information (subject ID, email, name, etc.).
In CIAM, use OAuth 2.0 when you need delegated access to user resources; use OpenID Connect when you need to verify user identity and get their profile information (SSO).
Analogy
Think of OAuth as a hotel key card that opens your room (access); OpenID Connect is that PLUS your ID badge that proves who you are (identity).
Types and Use Cases
OAuth 2.0 Use Cases:
- "Delegated API access - allow apps to access Google Calendar, Drive on user's behalf"
- "Machine-to-machine (M2M) authorization - service accounts accessing APIs"
- "Scoped permissions - limit what third-party apps can access (read-only vs read-write)"
OpenID Connect Use Cases:
- "Single Sign-On (SSO) - 'Sign in with Google' uses OIDC"
- "Customer identity verification - verify who the user is, get their profile"
- "Federated identity - connect to Azure AD, Okta, Ping for enterprise SSO"
How it Works
{
"oauth2_flow": {
"grant_type": "authorization_code",
"tokens_issued": ["access_token"],
"purpose": "delegated_access",
"scopes": ["https://www.googleapis.com/auth/drive.readonly"]
},
"oidc_flow": {
"grant_type": "authorization_code",
"tokens_issued": ["access_token", "id_token"],
"purpose": "authentication_plus_access",
"scopes": ["openid", "profile", "email"],
"id_token_claims": {
"iss": "https://accounts.google.com",
"sub": "1234567890",
"email": "user@gmail.com",
"name": "User Name"
}
}
}OAuth vs OpenID Connect vs OpenID Connect
OAuth vs OpenID Connect
OpenID Connect
OAuth 2.0 provides authorization only (access tokens for API access)
OIDC provides authentication + authorization (ID token + access token)
OAuth 2.0 tokens don't contain user identity (opaque)
OIDC ID tokens are self-contained JWTs with user info (iss, sub, email)
OAuth 2.0 is for delegated access (app accesses resources on user's behalf)
OIDC is for identity verification (proving who user is)
OIDC is built on top of OAuth 2.0 - adds /userinfo endpoint, ID token, standard scopes (openid, profile, email)
OAuth 2.0 requires additional API calls to get user info (if needed)
OIDC includes user info in the ID token (no extra call needed)
Best Practices for OAuth vs OpenID Connect
CIAM Implementation Best Practices:
- Use OIDC for customer login (SSO): When you need to know who the user is and get their profile, use OIDC (not plain OAuth 2.0)
- Use OAuth 2.0 for API authorization: When your app needs to access user's resources (Google Drive, calendar), use OAuth 2.0 with scoped tokens
- Validate ID tokens properly: For OIDC, always validate issuer (iss), audience (aud), expiration (exp), and signature using JWKS endpoint
- Don't confuse the two: If you only need authorization (access APIs), OAuth 2.0 is sufficient; if you need to authenticate users (SSO), use OIDC
- LoginRadius handles both: As an OIDC Provider, LoginRadius issues ID tokens; as an OAuth Client, it connects to social providers (Google, Microsoft) for social login
How LoginRadius Powers OAuth vs OpenID Connect
LoginRadius CIAM platform provides comprehensive support for both OAuth 2.0 and OpenID Connect standards, enabling flexible identity architectures for any use case.
As an OIDC Provider (for your applications):
- Issues ID tokens (JWT) and access tokens for your custom applications
- Supports Authorization Code Flow (recommended), Implicit Flow, and Hybrid Flow
- Provides /userinfo endpoint for fetching additional user claims
- Implements PKCE for mobile/native app security (prevents authorization code interception)
As an OAuth 2.0/OIDC Client (connecting to providers):
- Connects to 40+ social providers (Google, Microsoft, Apple, Facebook) via OAuth 2.0/OIDC
- Normalizes user profile data across all providers into a consistent schema (name, email, profile pic)
- Supports OIDC for enterprise SSO (Azure AD, Okta, Ping Identity, SAML 2.0)
Advanced Features:
- Adaptive authentication: Trigger MFA, step-up auth based on risk scoring (works with OAuth/OIDC flows)
- Scope management: Configure custom scopes (profile, email,
https://custom.api) for fine-grained authorization - Token validation: LoginRadius validates ID tokens, verifies signatures using JWKS, checks expiration and audience
- Compliance: OAuth/OIDC implementations are SOC 2, ISO 27001 compliant for enterprise CIAM
FAQs
- Use OpenID Connect (OIDC) for customer login/SSO - you need to know who the user is, get their profile (name, email), and create a session
- Use OAuth 2.0 for delegated API access - your app needs to access user's resources (Google Drive files, GitHub repos) on their behalf
- OIDC is recommended for CIAM because it includes authentication (proof of identity) which is the primary goal of customer identity platforms
- LoginRadius supports both: Acts as OIDC Provider (for your apps) and OIDC/OAuth Client (connecting to social providers like Google)
- No. OAuth 2.0 is an authorization framework (granting access to resources); OpenID Connect is an identity layer on top of OAuth 2.0 (verifying user identity)
- OIDC = OAuth 2.0 + ID Token + standard scopes (openid, profile, email) + /userinfo endpoint
- Think of OAuth as "access delegation" (hotel key card - opens room); OIDC as "access delegation + ID badge" (proves who you are)
- In practice: "Sign in with Google" uses OIDC; "Allow app to access your Google Drive" uses OAuth 2.0
- LoginRadius as OIDC Provider: Issues ID tokens and access tokens to your applications; supports standard OIDC flows (Authorization Code, Implicit)
- LoginRadius as OAuth/OIDC Client: Connects to 40+ social providers (Google, Microsoft, Apple) via OAuth 2.0/OIDC for social login
- Normalized user profiles: Regardless of whether you use OAuth or OIDC, LoginRadius normalizes user profile data across all providers into a consistent schema
- Enterprise SSO: LoginRadius supports OIDC connections to Azure AD, Okta, Ping Identity for B2B CIAM scenarios
- SDK support: LoginRadius provides SDKs for JavaScript, React, Android, iOS, and server-side languages to integrate OAuth/OIDC flows easily