"There is a JavaScript error in your browser console" error message appears when accessing the Service Portal form.Issue When the user opens up a form in the Service Portal, this JavaScript error appears on the screen: "There is a JavaScript error in your browser console".CauseThis error typically originates in a Client script that runs on the form. You will have to identify which script is it and troubleshoot from there.ResolutionYou will find more details about the error in the browser console. Go to that script and troubleshoot from there. In order to open the browser developer tool console, Right-click anywhere on the form.Select InspectSelect the Console tab Find the Client script that is causing the issue. You will either need to update this script to work on both portal and backend views, or you will need to write a different script to run only on the portal, and leave the current script to run only on Desktop.Related LinksThere are a few methods that are not supported in mobile/service portals but work fine in native UI. Avoid such methods while creating Client scripts for the portal. Refer to the following product docs that explain more about unsupported methods. Service Portal and client scriptsSupported features in Service PortalGlideForm - Client