This is Perl module JavaScript::Value::Escape. INSTALLATION JavaScript::Value::Escape installation is straightforward. If your CPAN shell is set up, you should just be able to do % cpan JavaScript::Value::Escape Download it, unpack it, then build it as per the usual: % perl Makefile.PL % make && make test Then install it: % make install DOCUMENTATION JavaScript::Value::Escape documentation is available as in POD. So you can do: % perldoc JavaScript::Value::Escape to read the documentation online with your favorite pager. Masahiro Nagano