Gigya's client side javascript is intended to be run in the browser as much as possible, since they perform 2 part authentication using cookies set by their domains. You can try to port it to run server side, but none of the public methods will work as advertised.
I've written a wrapper for their REST API using their proprietary authentication that I've been using in a work project for a few weeks: https://github.com/jproulx/Gigya-Node-SDK -- note that not everything has been tested thoroughly as I've only needed to use a subset of the socialize services on the server side. It should serve as a good jumping off point to bootstrap something for your needs.