Intermediate5 min readShare
Was this chapter helpful?
Share
Add "Sign in with Google" to your app. Let users log in with accounts they already have instead of creating a new password.
Don't worry — you won't write any OAuth code by hand. Your AI tool handles all the technical parts. This guide helps you understand the concepts so you can describe what you want.
Users don't need to remember another password
Signup takes one click instead of filling out a form
You get verified email addresses automatically
Reduces fake accounts and spam signups
Higher conversion — fewer people abandon the signup flow
The auth provider handles security (Google, GitHub, etc.)
The most popular option. Almost everyone has a Google account. Add this one first.
Best for: Everyone
Great for developer tools, coding apps, and tech communities. Less useful for consumer apps.
Best for: Developers
Required if your app is on the App Store. Good for premium/consumer apps with Apple-heavy users.
Best for: iOS users
Your app redirects them to Google's login page.
Google handles the password, 2FA, and verification. Your app never sees the password.
You receive their name, email, and profile picture. Your app creates or finds their account.
They're now authenticated in your app. A session cookie keeps them logged in.
After a user signs in with Google (or any provider), your app receives some basic profile info. Here's what you typically get:
Name
Jane SmithTheir display name from Google/GitHub. You can show this in your app's header or profile page.
jane@gmail.comA verified email address. You don't need to send a confirmation email — the provider already verified it.
Profile Picture
https://..../photo.jpgA URL to their avatar image. Great for showing in the navigation bar or comments.
Unique User ID
google_12345abcdeA unique identifier for this user. Your app uses this to find or create their account in your database.
Important: You never receive the user's password. The auth provider handles all password management and security. Your app only gets the info listed above.
Pre-built login components with social providers. Add Google login in 5 minutes. The easiest option.
Built into Supabase. Good if you're already using Supabase for your database. Google, GitHub, Apple, and more.
Open-source, self-hosted. More setup work but full control. Supports 50+ providers.
These are the mistakes that trip up almost everyone when setting up social login for the first time:
After the user logs in on Google's page, Google needs to know where to send them back. You must add your app's URL (like https://yoursite.com/api/auth/callback) in the Google Cloud Console. Without this, login will fail with a 'redirect_uri_mismatch' error.
Tell AI: 'What callback URL do I need to set in Google Cloud Console for my Next.js app using [Clerk/Supabase/NextAuth]?'
Sometimes users click 'Sign in with Google' but then hit 'Cancel' on Google's page. If your app doesn't handle this, users see a broken page or a confusing error instead of being sent back to the login page.
Tell AI: 'Handle the case where a user cancels the Google login flow. Redirect them back to the login page with a friendly message.'
Some users don't want to link their Google account to your app, or they don't have a Google account. Always offer email/password as a backup option alongside social login.
Tell AI: 'Add both Google sign-in and email/password signup on my login page. Make Google the primary option with email/password below it.'
Your local dev URL (http://localhost:3000) is different from your live URL (https://yoursite.com). You need to add both in your auth provider's settings, or login will work locally but break when you deploy.
Tell AI: 'How do I configure my [Clerk/Supabase/NextAuth] OAuth settings to work on both localhost and my production domain?'
Yes, social login is actually safer than building your own login system. When users sign in with Google, your app never sees or stores their password — Google handles all of that. You only receive basic profile info (name, email, picture). The big providers (Google, Apple, GitHub) invest heavily in security, so you're leveraging their expertise.
Yes, and you should offer both options. Some users prefer not to link their Google account. Most auth services (Clerk, Supabase Auth, NextAuth) let you enable both social login AND email/password on the same login page. Tell your AI: 'Add a login page with Google sign-in and an email/password option.'
This depends on your auth provider. Most services like Clerk and Supabase handle this automatically by linking accounts with the same email. If you're using NextAuth, you may need to configure account linking. Tell your AI: 'Make sure accounts with the same email are automatically linked, whether they sign in with Google or email/password.'
Add Google login with Clerk
"Add Google Sign-In to my Next.js app using Clerk. Set up the Clerk provider in my layout, add a sign-in page at /sign-in with Google as the primary option, and protect the /dashboard route so only logged-in users can access it. Show the user's name and avatar in the header when logged in."
Add GitHub login with Supabase
"Add GitHub login to my Next.js app using Supabase Auth. Set up the Supabase client, create a login page with a 'Sign in with GitHub' button, handle the OAuth callback, and store the user session. Redirect to /dashboard after login."
Add multiple social providers
"Add social login to my app with Google, GitHub, and Apple sign-in options. Use Clerk (or NextAuth.js). Show all three options on the login page with their official brand icons. After login, redirect to /dashboard and show the user's profile info."