It won’t work with any .z5 try with a .z3. Later I can make XJSZM which will support other Z-machine version too. Also, the API has changed since display.html was made (which didn’t work anyways), so try using the example front-end for Node.js which works better. You can also try to write your own HTML-based front-end; hopefully you know how to do it better than I do (I couldn’t get scrolling to work properly).
Version 2.0.2 of JSZM is now released, which fixes a minor bug with PRINTC and which now has documentation. (When XJSZM is released, it will be announced possibly on a different thread.)