From 6cd438bc82b544b788bf374c7f42999ec1867ea7 Mon Sep 17 00:00:00 2001
From: Miles <105828519+mbocianski@users.noreply.github.com>
Date: Mon, 1 Jun 2026 09:45:42 -0700
Subject: [PATCH] Update JavaScript replay SDK to register device ID

Set anonymous ID for RudderAnalytics and Mixpanel to include "device" prefix
---
 .../docs/tracking-methods/sdks/javascript/javascript-replay.mdx  | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pages/docs/tracking-methods/sdks/javascript/javascript-replay.mdx b/pages/docs/tracking-methods/sdks/javascript/javascript-replay.mdx
index e1f408ab7e..5c4493fc83 100644
--- a/pages/docs/tracking-methods/sdks/javascript/javascript-replay.mdx
+++ b/pages/docs/tracking-methods/sdks/javascript/javascript-replay.mdx
@@ -544,6 +544,7 @@ mixpanel.init('MIXPANEL-PROJECT-TOKEN', {
     window.rudderanalytics.ready(function() {
       const rudderAnonymousId = rudderanalytics.getAnonymousId();
       if (rudderAnonymousId) {
+	rudderanalytics.setAnonymousId('$device:' + rudderAnonymousId);
 	mixpanel.register({ $device_id: rudderAnonymousId, distinct_id : "$device:"+rudderAnonymousId });
 		
 		// Enable heatmap data now that the correct device_id is registered.