Node.js WebSocket Notification API reconnection dropping events

NICE CXone API & Integrations
1

Building a reconnection handler for the Notification API in Node.js. The initial handshake works fine, but when I kill the connection and retry, the server sends a 200 OK then immediately closes the socket without sending any events.

Here’s the reconnect logic:

ws.on('close', (code, reason) => {
 setTimeout(() => {
 const newWs = new WebSocket(`wss://${orgHost}/api/v2/notifications`);
 newWs.on('open', () => {
 newWs.send(JSON.stringify({
 action: 'subscribe',
 topic: 'routing.agents'
 }));
 });
 }, 5000);
});
  • Node 18 LTS
  • Using native ws package
  • Token is valid and refreshed via OAuth

Tried adding a random query param to force a new session, didn’t help. Any idea why the subscription isn’t sticking after reconnect?