Developing applications with Couchbase Mobile offers numerous possibilities for server-side integration, such as using the Sync Gateway document "changes" feed for event-driven operations and managing synchronization conflicts. While PouchDB provides a compatible JavaScript option, a lighter alternative using Swagger is now available. Swagger not only documents Couchbase Mobile APIs but also generates client SDKs in 40 languages, facilitating the creation of applications. This post demonstrates using the Swagger Node.js client to build a simple app that monitors document changes in Couchbase, using Node.js, Swagger JS, and Couchbase Sync Gateway. The example app showcases setting up the Sync Gateway, configuring the Swagger client, and implementing a monitoring function that reacts to changes by leveraging sequence IDs for updates. The post also highlights the utility of Swagger in generating server stub code, test cases, and sandbox sites, and concludes with pointers to additional resources for further exploration of Couchbase Mobile and Swagger's capabilities.