Login to Single Page Application with Google authentication and Google Oauth 2.0?

If all you need is the user's email address, then you would be better off using OpenID instead of OAuth. OAuth provides access to a user's account and services, scoped to a specific resource or set of resources. OpendID is designed just for logging into a third-party service.

You can then extract the user's ID and email address from the OpenID login. Note: The ID will always be sent but the email address has to be explicitly requested during authentication.

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