INVALID_CLIENT Redirect URI Error

Spotify compared the callback Songify used with the URI list on your developer app, and they didn't match. It has to be character-for-character.

On the Spotify Developer Dashboard, edit your app and put this in Redirect URIs:

http://127.0.0.1:4002/auth

Then click Add, then Save. People miss Add constantly.

Use all of this as-is:

• http://, not https://
• 127.0.0.1, not localhost
• port 4002
• path /auth
• no trailing slash, no space

In Songify, Settings → Spotify, the dropdown next to Link should also be 127.0.0.1. Then try Link again.

If you already saved a wrong URI, delete it from the Spotify app so only the line above remains.