Does anybody know how to deploy spacy-js server with node.js/express web app on heroku?

So the spacy-js server specifically runs on port 8080, and I don't know whether heroku will recognize this port. My spacy-js is currently in node_modules, with all my other modules installed through npm. My web app works perfectly locally but the app keeps crashing on heroku. Does anyone have any tips or method to deploy the spacy-js server with the node.js/express web app?