Root Cause Analysis

Error

The redirect_uri is not associated with this application.

Root Cause

The GitHub OAuth App configuration is missing the required redirect URI.

Current Redirect URI (not configured):

https://www.tinte.dev/api/auth/callback/github

Technical Context

• App uses Better Auth with GitHub social provider
• Better Auth automatically handles OAuth callbacks at /api/auth/callback/{provider}
• GitHub OAuth requires all redirect URIs to be pre-registered in the app settings

Solution

Add the redirect URI to GitHub OAuth App settings:

1. Go to: https://github.com/settings/developers
2. Select OAuth App with client ID: Ov23li084KGytACj3Oe2
3. Add to "Authorization callback URL":

   https://www.tinte.dev/api/auth/callback/github
   

For Local Development

Also add:

http://localhost:3000/api/auth/callback/github

Files Involved

• src/lib/auth.ts - GitHub OAuth configuration
• src/app/api/auth/[...all]/route.ts - Better Auth handler (manages callback route)

Prevention

When deploying to new domains (staging, preview, etc.), ensure redirect URIs are added to GitHub OAuth App settings before testing authentication.