diff --git a/templates/android/library/src/main/java/io/package/services/Realtime.kt.twig b/templates/android/library/src/main/java/io/package/services/Realtime.kt.twig
index c2301d400c..269c3d0403 100644
--- a/templates/android/library/src/main/java/io/package/services/Realtime.kt.twig
+++ b/templates/android/library/src/main/java/io/package/services/Realtime.kt.twig
@@ -73,7 +73,12 @@ class Realtime(client: Client) : Service(client), CoroutineScope {
             val encodedProject = java.net.URLEncoder.encode(client.config["project"].toString(), "UTF-8")
             val queryParams = "project=$encodedProject"
             val url = "${client.endpointRealtime}/realtime?$queryParams"
-            val request = Request.Builder().url(url).build()
+            val requestBuilder = Request.Builder().url(url)
+            val jwt = client.config["jwt"]
+            if (!jwt.isNullOrEmpty()) {
+                requestBuilder.addHeader("x-{{ spec.title | caseLower }}-jwt", jwt)
+            }
+            val request = requestBuilder.build()
 
             val generation = socketGeneration.incrementAndGet()
             socket = client.http.newWebSocket(request, {{ spec.title | caseUcfirst }}WebSocketListener(generation))
diff --git a/templates/apple/Sources/Services/Realtime.swift.twig b/templates/apple/Sources/Services/Realtime.swift.twig
index 255cd0dea3..c231bd9bbb 100644
--- a/templates/apple/Sources/Services/Realtime.swift.twig
+++ b/templates/apple/Sources/Services/Realtime.swift.twig
@@ -135,9 +135,15 @@ open class Realtime : Service {
             return
         }
 
+        var headers = HTTPHeaders()
+        if let jwt = client.config["jwt"], !jwt.isEmpty {
+            headers.add(name: "x-{{ spec.title | caseLower }}-jwt", value: jwt)
+        }
+
         socketClient = WebSocketClient(
             url,
             tlsEnabled: !client.selfSigned,
+            headers: headers,
             delegate: self
         )
 
diff --git a/templates/flutter/lib/src/realtime_browser.dart.twig b/templates/flutter/lib/src/realtime_browser.dart.twig
index 3563e7d983..a0f4193ab4 100644
--- a/templates/flutter/lib/src/realtime_browser.dart.twig
+++ b/templates/flutter/lib/src/realtime_browser.dart.twig
@@ -22,6 +22,15 @@ class RealtimeBrowser extends RealtimeBase with RealtimeMixin {
 
   Future<WebSocketChannel> _getWebSocket(Uri uri) async {
     await (client as ClientBrowser).init();
+
+    final jwt = client.config['jwt'];
+    if (jwt != null && jwt.isNotEmpty) {
+      uri = uri.replace(queryParameters: {
+        ...uri.queryParameters,
+        'jwt': jwt,
+      });
+    }
+
     return HtmlWebSocketChannel.connect(uri);
   }
 
diff --git a/templates/flutter/lib/src/realtime_io.dart.twig b/templates/flutter/lib/src/realtime_io.dart.twig
index e8cd2ebb3d..d45450dffc 100644
--- a/templates/flutter/lib/src/realtime_io.dart.twig
+++ b/templates/flutter/lib/src/realtime_io.dart.twig
@@ -32,6 +32,11 @@ class RealtimeIO extends RealtimeBase with RealtimeMixin {
     final cookies = await (client as ClientIO).cookieJar.loadForRequest(uri);
     headers = {HttpHeaders.cookieHeader: CookieManager.getCookies(cookies)};
 
+    final jwt = client.config['jwt'];
+    if (jwt != null && jwt.isNotEmpty) {
+      headers['x-{{ spec.title | caseLower }}-jwt'] = jwt;
+    }
+
     final websok = IOWebSocketChannel((client as ClientIO).selfSigned
         ? await _connectForSelfSignedCert(uri, headers)
         : await WebSocket.connect(uri.toString(), headers: headers));
diff --git a/templates/react-native/src/client.ts.twig b/templates/react-native/src/client.ts.twig
index 5d1c60cb5b..8ba12235ed 100644
--- a/templates/react-native/src/client.ts.twig
+++ b/templates/react-native/src/client.ts.twig
@@ -328,6 +328,11 @@ class Client {
             const channels = new URLSearchParams();
             channels.set('project', this.config.project);
 
+            const jwt = this.config.jwt;
+            if (jwt && Platform.OS === 'web') {
+                channels.set('jwt', jwt);
+            }
+
             const url = this.config.endpointRealtime + '/realtime?' + channels.toString();
 
             if (
@@ -347,7 +352,8 @@ class Client {
                 // @ts-ignore
                 this.realtime.socket = new WebSocket(url, undefined, {
                     headers: {
-                        Origin: `{{ spec.title | caseLower }}-${Platform.OS}://${this.config.platform}`
+                        Origin: `{{ spec.title | caseLower }}-${Platform.OS}://${this.config.platform}`,
+                        ...(jwt && Platform.OS !== 'web' ? { 'x-{{ spec.title | caseLower }}-jwt': jwt } : {})
                     }
                 });
                 this.realtime.socket.addEventListener('message', this.realtime.onMessage);
diff --git a/templates/unity/Assets/Runtime/Realtime.cs.twig b/templates/unity/Assets/Runtime/Realtime.cs.twig
index 64f8dcc1b5..b644d55a0a 100644
--- a/templates/unity/Assets/Runtime/Realtime.cs.twig
+++ b/templates/unity/Assets/Runtime/Realtime.cs.twig
@@ -523,17 +523,24 @@ namespace {{ spec.title | caseUcfirst }}
             {
                 var uri = PrepareUri();
                 Debug.Log($"[Realtime] Connecting to URI: {uri}");
-                
+
+                var headers = new Dictionary<string, string>();
+                var jwt = _client.Config.GetValueOrDefault("jwt");
+                if (!string.IsNullOrEmpty(jwt))
+                {
+                    headers["x-{{ spec.title | caseLower }}-jwt"] = jwt;
+                }
+
                 if (_webSocket == null || _webSocket.State == WebSocketState.Closed)
                 {
-                    _webSocket = new WebSocket(uri);
+                    _webSocket = new WebSocket(uri, headers);
                     _lastUrl = uri;
                     SetupWebSocketEvents();
                 }
                 else if (_lastUrl != uri && _webSocket.State != WebSocketState.Closed)
                 {
                     await CloseConnection();
-                    _webSocket = new WebSocket(uri);
+                    _webSocket = new WebSocket(uri, headers);
                     _lastUrl = uri;
                     SetupWebSocketEvents();
                 }
diff --git a/templates/web/src/client.ts.twig b/templates/web/src/client.ts.twig
index 40eb362d59..9744bdf3f9 100644
--- a/templates/web/src/client.ts.twig
+++ b/templates/web/src/client.ts.twig
@@ -564,7 +564,11 @@ class Client {
 
             const encodedProject = encodeURIComponent((this.config.project as string) ?? '');
             // URL carries only the project; channels/queries are sent via subscribe message.
-            const queryParams = 'project=' + encodedProject;
+            let queryParams = 'project=' + encodedProject;
+
+            if (this.config.jwt) {
+                queryParams += '&jwt=' + encodeURIComponent(this.config.jwt as string);
+            }
 
             const url = this.config.endpointRealtime + '/realtime?' + queryParams;
 
diff --git a/templates/web/src/services/realtime.ts.twig b/templates/web/src/services/realtime.ts.twig
index 2d4514718c..5dc18d8878 100644
--- a/templates/web/src/services/realtime.ts.twig
+++ b/templates/web/src/services/realtime.ts.twig
@@ -208,7 +208,14 @@ export class Realtime {
         }
 
         // URL carries only the project; channels/queries are sent via the subscribe message.
-        const queryParams = `project=${projectId}`;
+        let queryParams = `project=${projectId}`;
+
+        const jwt = this.client.config.jwt;
+{% if language.name != 'ReactNative' %}
+        if (jwt) {
+            queryParams += `&jwt=${encodeURIComponent(jwt)}`;
+        }
+{% endif %}
 
         const endpoint =
             this.client.config.endpointRealtime !== ''
@@ -243,10 +250,11 @@ export class Realtime {
 {% if language.name == 'ReactNative' %}
                 const WebSocketCtor: any = WebSocket;
                 const socket = (this.socket = Platform.OS === 'web'
-                    ? new WebSocketCtor(url)
+                    ? new WebSocketCtor(jwt ? `${url}&jwt=${encodeURIComponent(jwt)}` : url)
                     : new WebSocketCtor(url, undefined, {
                         headers: {
-                            Origin: `{{ spec.title | caseLower }}-${Platform.OS}://${this.client.config.platform}`
+                            Origin: `{{ spec.title | caseLower }}-${Platform.OS}://${this.client.config.platform}`,
+                            ...(jwt ? { 'x-{{ spec.title | caseLower }}-jwt': jwt } : {})
                         }
                     }));
 {% else %}