socket.io v2.x with a wildcard event
socketio-wildcard is a middleware extension for Socket.io that enables wildcard event handling, allowing applications to catch all incoming events with a single listener rather than registering handlers for specific event names. Built for Socket.io versions 1.x through 2.x and tested on Node.js 8.x through 12.x, the project is maintained by an individual developer and provides both server-side and client-side implementations. The project is now considered feature-complete and sunsetted, as Socket.io v2.0.4 introduced native socket middleware that accomplishes similar functionality.