Lovable
auth
OAuth Callback URL Mismatch with GitHub/Google Provider
OAuth authentication fails with error 'redirect_uri_mismatch' or callback page shows blank/error. Users cannot sign in via GitHub or Google because the configured redirect URL doesn't match.
OAuth providers validate that the redirect URL matches exactly what was registered. Any difference in protocol, domain, path, or query parameters will cause the mismatch error.
Error Messages You Might See
error=redirect_uri_mismatch
invalid_request
The redirect_uri provided is not registered
Common Causes
- Localhost used in development but https://mysite.com in production config
- Port number mismatch (localhost:3000 vs localhost:5173)
- Protocol mismatch (http vs https)
- Trailing slash differences in callback URL
- Using wrong site domain after deployment
How to Fix It
In Supabase dashboard > Authentication > Providers > GitHub/Google, set redirect URLs:
Development: http://localhost:5173/auth/callback
Production: https://yourdomain.com/auth/callback
Create both entries if supporting both environments. Ensure Vite dev server runs on the exact port configured.
Real developers can help you.
Matt Butler
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5 years+ Experienced Dev (Specially in Web Development), can help in python, javascript, react, next.js and full stack web dev technologies.
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Full-stack developer experienced in fixing and deploying AI-generated apps from Lovable, Bolt.new, Cursor, and Replit. I specialize in debugging Supabase integration issues (auth flows, RLS policies, database connections), fixing broken deployments, resolving routing/blank screen problems, and cleaning up messy React/Vite codebases. I also build production apps with the Claude API and have shipped a Mac desktop dev tool (Nexterm from scratch. Based in Hong Kong, fast turnaround.
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You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
Do I need HTTPS for callbacks?
Yes for production. Development with localhost HTTP is allowed. All production URLs must use HTTPS.
How do I use different URLs for dev and prod?
Register both URLs in the OAuth provider settings. Use environment variables to switch between them.