Deleting the Discord data folders is the most common fix for Discord JavaScript errors when trying to start up the application. Essentially, you'll be deleting what could be corrupt or broken ...

Check for an update, turn off extensions, or try a different browser Script errors can be difficult to pin down because these errors aren't descriptive. Script errors are intentionally designed ...

If you’re running Discord on a Windows 7 machine, you can follow these steps to fix your fatal Javascript error: Click the Start button on the taskbar, or press the Windows key on the keyboard.