How do I set up social login with Google and Apple?

To set up social login with Google and Apple, you usually need to do two things:

1. Configure the provider in the provider’s developer console
2. Implement the OAuth / OpenID Connect flow in your app and backend

Here’s a practical overview.

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1) Google login

A. Create Google OAuth credentials

In Google Cloud Console:

1. Create or select a project
2. Go to APIs & Services → OAuth consent screen
3. Configure the consent screen:
   • App name
   • Support email
   • Authorized domains
   • Scopes you need
4. Go to Credentials → Create Credentials → OAuth client ID
5. Choose the app type:
   • Web application for websites/backend
   • Android/iOS for mobile apps
   • Often you’ll also use a Web client ID with mobile sign-in

You’ll get a:

• Client ID
• Client secret (for server-side/web apps)

B. Add redirect URIs

For web OAuth, set:

• https://yourdomain.com/auth/google/callback

For local dev:

• http://localhost:3000/auth/google/callback

C. Implement sign-in

Use Google’s OAuth/OpenID Connect flow:

1. Redirect user to Google login/consent screen
2. Google returns an authorization code to your redirect URI
3. Your backend exchanges the code for tokens
4. Verify the ID token
5. Create or log in the user in your system

D. Useful libraries

• Node.js: passport-google-oauth20, google-auth-library
• Python: authlib
• React Native / mobile: Google Sign-In SDKs
• Flutter: google_sign_in

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2) Apple login

Apple Sign In is a little more strict than Google.

A. Set up Apple Developer account

You need:

• An Apple Developer Program membership

In Apple Developer portal:

1. Go to Certificates, Identifiers & Profiles
2. Create an App ID / Service ID
3. Enable Sign in with Apple
4. Create a Key for Sign in with Apple
5. Note:
   • Team ID
   • Service ID
   • Key ID
   • Private key (.p8 file)

B. Configure redirect URI

For web apps, Apple requires a verified redirect URL, for example:

• https://yourdomain.com/auth/apple/callback

You also need to register this redirect URI in:

• Service ID
• Your backend/auth provider config

C. Implement Apple OAuth

Flow is similar:

1. User clicks “Sign in with Apple”
2. Apple returns an authorization code and identity token
3. Your backend verifies the token using Apple’s public keys
4. Create or log in the user

D. Apple-specific notes

• Apple may only provide the user’s name/email the first time
• You must support private relay email
• If your app has other social login options, Apple may require Sign in with Apple too (especially for iOS apps)

E. Useful libraries

• Node.js: passport-apple, apple-signin-auth
• Python: authlib
• iOS: AuthenticationServices
• React Native / Flutter: platform-specific Apple sign-in plugins

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3) Recommended architecture

A common setup is:

• Frontend: starts login and receives success/failure
• Backend: handles code exchange and token verification
• Database: stores users linked by provider IDs

Store user identity like:

• provider = google/apple
• provider_user_id = Google sub / Apple user identifier
• email
• name
• email_verified

If the email matches an existing account, decide whether to:

• link accounts automatically, or
• ask user to confirm linking

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4) Security best practices

• Use Authorization Code Flow with PKCE for public clients
• Always verify ID tokens on the backend
• Validate:
  • issuer
  • audience
  • expiration
  • nonce/state
• Use HTTPS in production
• Don’t trust profile data from the frontend alone
• Protect against CSRF with state
• For Apple, securely store the .p8 private key

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5) If you want the fastest implementation

If you don’t want to build and maintain the OAuth logic yourself, use an auth provider like:

• Auth0
• Firebase Authentication
• Supabase Auth
• Clerk
• Cognito

These services can simplify Google/Apple login a lot.

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6) Quick checklist

Google

• Create OAuth consent screen
• Create OAuth client ID
• Add redirect URI(s)
• Implement code exchange + token verification

Apple

• Join Apple Developer Program
• Create Service ID and Sign in with Apple key
• Register redirect URI
• Implement Apple auth + token verification

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If you want, I can give you:

1. a step-by-step setup for your specific stack (e.g. React, Next.js, Node, Flutter, iOS), or
2. a working example code for Google + Apple login.