Prompt
Do I need OAuth for Google sign in?
Latest observation
Oct 6, 2026
OpenAI APIWeb search: off
Usually, yes — if you want to let users “Sign in with Google,” you generally use OAuth 2.0 (specifically Google’s OpenID Connect on top of OAuth).
In short
- Google sign-in for your app/site: use OAuth/OpenID Connect
- Just accessing a Google API on behalf of a user: also use OAuth 2.0
- Only verifying a Google user’s identity: use Google Sign-In / OpenID Connect
Why
OAuth is the standard way to:
- redirect the user to Google
- let them approve access
- return an authorization code / token to your app
- identify the user and/or access Google data safely
Common cases
- Web app / backend app: OAuth 2.0 Authorization Code flow
- SPA / mobile app: OAuth 2.0 with PKCE
- Backend service to backend service: service accounts, not user OAuth
If you want, I can tell you the exact flow to use for your app type (web, mobile, SPA, desktop).
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