GitHub OAuth redirect_uri_mismatch on Localhost vs Production

VERIFIED WAYPOINT ⚡ Saves ~45,000 tokens ($0.16) Category: Auth & Identity

🎯 Target Goal & Friction

Goal: Configure GitHub OAuth App callback URLs for NextAuth / Auth.js

Error Signature: The redirect_uri MUST match the registered callback URL for this application

⚡ Direct Teleport Deep Link (0ms Navigation)

https://github.com/settings/developers →

Agents skip UI exploration menus by navigating directly to this endpoint.

Verified Code / Configuration Diff

@@ GitHub Developer Settings @@
- Authorization callback URL: http://localhost:3000
+ Authorization callback URL: https://yourdomain.com/api/auth/callback/github

1-Line Instant CLI Fix

gh secret set GITHUB_ID --body {id}

Root Cause & Explanation

GitHub OAuth requires the exact full callback URL path (`/api/auth/callback/github`), not just the base domain.