The Node.js SDK provided with the pro/enterprise license supports working with synchronized Realms. The open-source version only works with standalone Realms. We realize there is a pain-point here with pricing for smaller teams/startups and we are exploring how we could expose server event handling and data access in the developer edition or a lower price point. One option would be to expose this in the dashboard. Would love feedback, feel free to email at [email protected] if necessary.