Manual:Jsparse.php

Details
jsparse.php file is a maint-scripts>Special:MyLanguage/Manual:Maintenance scripts|maintenance script for testing JavaScript validity parses using JSMin+'s parser. This is a useful feature to run parsing/syntax check on JavaScript files.

Arguments
This takes file(s) as their first argument which you want to validate.

Usage
Filename: splitList.js
 * Checking splitList.js JavaScript file

Filename: wrongSplitList.js
 * Checking wrongSplitList.js JavaScript file

Common error
It comes when the file does not exist or the user running the script does not have permission to read the file.
 * $filename ERROR: could not read file

In case file does exist, check file permission. If you are root user then you can run script with sudo.