Firstly, open Task Manager and make sure no process related to Discord is running in the background. Then, evoke the Run dialog box by pressing the Win+R hotkey. Now, type %appdata% in the Open ...

Deleting the Discord data folders is the most common fix for Discord JavaScript errors when trying to start up the application.

How to fix Discord Javascript error? These are the solutions that you can try if get a Discord Javascript error occurred message when launching Discord, or after it crashes. Fix #1: Check for updates.