Respond with "Hello, {firstName}!" if the user is signed in and Hello, World! if the user is not signed in with
Hello, Alex!
'Google redirects user after siging in. Uses code in query parameters to verify. Creates JWT token which should be passed into every request for authentication in the future. JWT Token contains firstName, lastName, email, id and createdAt time. Signed with JWT secret stored on server side in environment variable. If the user doesn't exist it creates one with the information provided by Google'