What is OpenNMS.js? OpenNMS.js is both a command-line utility as well as a collection of JavaScript and TypeScript APIs for interacting with OpenNMS Horizon and Meridian servers. Command-Line Utility The CLI is a tool for performing a variety of operations against an OpenNMS server, most notably querying, acknowledging, and creating tickets from alarms. JavaScript and TypeScript API The JavaScript and TypeScript API provides access to a wide variety of functions for interacting with an OpenNMS server. It provides a core of functionality used by other OpenNMS tools, most notably Helm. OpenNMS.js Legal Notice