Manual:Jsparse.php

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

Options/Arguments
This script takes the filenames of the files to be validated as arguments, separated by spaces.

Common error
This error occurs 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

If the file does exist, check the file permissions. If you are root user, then you can run the script with sudo.