OAuth 2.0 OpenID
OAuth 2.0 OpenID is the protocol for delegated authentication and authorization. OAuth handles 'authorization' (accessing user data on behalf of user), OpenID handles 'authentication' (proving who you are). Used everywhere: Google Login, GitHub, Stripe. Senior engineers earn 25-35% premium for security expertise. Time to mastery: 10-14 weeks. Sits between cryptography and application security.
What is OAuth 2.0 OpenID
OAuth 2.0 is the industry standard for authorization (granting third-party applications access to user data without sharing passwords). OpenID Connect is an identity layer built on OAuth 2.0 for authentication (proving who a user is). Together, they enable "Sign in with Google," "Login via GitHub," and similar patterns. The flow: user clicks "Login with Google" → redirected to Google → user grants permission → redirected back with access token → app uses token to access user data. User never shares password; only Google knows it.
📋 Before you start
💰 Salary by region
| Region | Junior | Mid | Senior |
|---|---|---|---|
| USA | $85k | $140k | $230k |
| UK | $52k | $85k | $140k |
| EU | $58k | $95k | $155k |
| CANADA | $90k | $145k | $240k |
🎓 Certifications
⚖ Compare with
❓ FAQ
What's the difference between OAuth and OpenID?
Should I implement OAuth or use Auth0?
What's the PKCE flow?
How do I refresh access tokens?
What are scopes in OAuth?
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