...This program expects the path to the .js file of the engine in the first parameter.
A wrapper for the open source Javascript Engine p4wn by Douglas Bagnall is provided as an example.
A successful and very complete implementation is the Javascript Chess Engine Lozza by Colin Jenkins. The webpage also includes a simple step-by-step guide setting up jsuci with Lozza.
http://op12no2.me/toys/lozza/
You may also want to try connecting this javascript translation of the chess engine Stockfish 5 to jsuci: https://github.com/exoticorn/stockfish-js