Thanks to the tireless work of Oliver Grawert we now have a handy tool called node-snapper which very easily turns your node.js project into a .snap package. It will automatically take care of bundling required libraries, other related node.js projects and will make a multi-arch ("fat") package available, so it will immediately work on armhf and amd64 architectures.
Intrigued? Check out our tutorial Turning node.js projects into snap packages.