OAuth2 vs SAML
In-Depth Technical Comparison & Architecture Guide
OAuth2 and SAML are the standards for identity federation. OAuth2 standardizes resource authorization, while SAML focuses on single sign-on.
Quick Reference Matrix
| Feature | OAuth2 | SAML 2.0 |
|---|---|---|
| Data Format | JSON (Access Token) | XML (Assertions) |
| Primary Focus | API resource authorization | Enterprise Single Sign-On (SSO) |
| Mobile Friendly | Yes | No |
Technology Overview
OAuth2 is designed for mobile and web APIs, issuing JSON tokens. SAML (Security Assertion Markup Language) is XML-based, common in enterprise environments.
API Tokens vs XML Assertions
SAML provides XML assertions containing user details passed via browser redirects. OAuth2 issues lightweight access tokens for API requests.
OAuth2 Advantages & Disadvantages
Advantages / Pros
- Lightweight for mobile
- Granular scopes
Disadvantages / Cons
- Requires OpenID Connect for authentication
SAML Advantages & Disadvantages
Advantages / Pros
- Mature enterprise SSO
- Cryptographic assertions
Disadvantages / Cons
- Heavy XML payloads
- Hard to configure
Real-World Use Cases
OAuth2
Third-party API access
Allowing apps to access photos on behalf of a user.
SAML
Corporate Single Sign-On
Logging employees into internal dashboards.
Developer Recommendation
Use OAuth2 (with OpenID Connect) for web and mobile customer APIs. Use SAML for enterprise employee directories.
Frequently Asked Questions
- Is OAuth2 an authentication protocol?
- No, OAuth2 is strictly an authorization framework.
Launch Interactive Developer Tools
Put these concepts into practice. Test, format, serialize, or analyze your inputs locally with these secure, browser-only utilities: