Google OAuth 2.0 – Express.js

A small learning project focused on implementing the OAuth 2.0 Authorization Code flow using Google and Express.js.

What I Learned

• OAuth 2.0 Authorization Code flow
• Redirect-based authentication
• CSRF protection using state
• Token exchange and ID token usage
• Session-based authentication in Express.js

Also Learned About PKCE and How its Works For Only Frontend Apps.