Prompt

Do I need OAuth if I just want sign in with Google?

Technology / Identity & Access1 observationLast seen Oct 6, 2026

Latest observation

Oct 6, 2026OpenAI APIWeb search: off

Yes — “Sign in with Google” uses OAuth 2.0, usually along with OpenID Connect (OIDC).

A quick way to think about it:

  • OAuth 2.0 = lets your app get permission to access Google data on the user’s behalf.
  • OpenID Connect = adds authentication (“who is the user?”) on top of OAuth 2.0.
  • Sign in with Google = typically implemented using Google’s OAuth 2.0 / OpenID Connect flow.

So if your goal is just:

  • “Let users click a button and sign in with their Google account”

then yes, you still need to use the OAuth/OIDC flow, but you usually don’t need to manually handle the full complexity yourself if you use Google’s client libraries or a third-party auth provider.

In practice

You’ll usually:

  1. Register your app in Google Cloud Console
  2. Create OAuth credentials
  3. Use Google’s sign-in flow
  4. Receive an ID token or authorization response
  5. Verify the token on your backend and create your own app session

Important distinction

If you only want Google login and not access to Google APIs:

  • You still use OAuth/OIDC
  • But you may only request the openid, email, and profile scopes

If you want, I can show you the simplest architecture for “Sign in with Google” for a web app, mobile app, or backend API.

Observation history

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