CheckJStatus is a tool that can check the status of pages containing JavaScript code without need to leave the current page.
Installation
Usage
The script adds an item with the same name to the My Tools menu, that opens a modal when clicked. You need to write the name of the target page (subpages are also working), after that you will get the data from the server. There are some links for navigation, including the link to the full list of local JS pages.