diff --git a/templates/1-basic/py/shinyreact.py b/templates/1-basic/py/shinyreact.py
index c7c9769..fe82475 100644
--- a/templates/1-basic/py/shinyreact.py
+++ b/templates/1-basic/py/shinyreact.py
@@ -4,6 +4,7 @@
 from shiny.html_dependencies import shiny_deps
 from shiny.types import Jsonifiable
 from shiny.render.renderer import Renderer, ValueFn
+from shiny.module import resolve_id
 from typing import Any, Mapping, Optional, Sequence, Union
 
 
@@ -22,7 +23,6 @@ def page_react(
     css_file: str | None = "main.css",
     lang: str = "en",
 ) -> ui.Tag:
-
     head_items: list[ui.TagChild] = []
 
     if js_file:
@@ -89,6 +89,10 @@ async def post_message(session: Session, type: str, data: JsonifiableIn):
     React components using useShinyMessageHandler() hook. This wraps messages in
     a standard format and sends them via the "shinyReactMessage" channel.
 
+    When used within a Shiny module (@module.server), the type is automatically
+    namespaced using resolve_id(). Outside of modules, the type is passed through
+    unchanged.
+
     Parameters
     ----------
     session
@@ -99,4 +103,7 @@ async def post_message(session: Session, type: str, data: JsonifiableIn):
     data
         The data to send to the client
     """
-    await session.send_custom_message("shinyReactMessage", {"type": type, "data": data})
+    namespaced_type = resolve_id(type)
+    await session.send_custom_message(
+        "shinyReactMessage", {"type": namespaced_type, "data": data}
+    )
diff --git a/templates/1-basic/r/shinyreact.R b/templates/1-basic/r/shinyreact.R
index 6c5b402..6adae4f 100644
--- a/templates/1-basic/r/shinyreact.R
+++ b/templates/1-basic/r/shinyreact.R
@@ -66,14 +66,19 @@ render_json <- function(
 #' React components using useShinyMessageHandler() hook. This wraps messages in a
 #' standard format and sends them via the "shinyReactMessage" channel.
 #'
+#' When used within a Shiny module (moduleServer), the type is automatically
+#' namespaced using session$ns(). Outside of modules, the type is passed through
+#' unchanged.
+#'
 #' @param session The Shiny session object
 #' @param type The message type (should match messageType in useShinyMessageHandler)
 #' @param data The data to send to the client
 post_message <- function(session, type, data) {
+  namespaced_type <- session$ns(type)
   session$sendCustomMessage(
     "shinyReactMessage",
     list(
-      type = type,
+      type = namespaced_type,
       data = data
     )
   )
diff --git a/templates/2-scaffold/py/shinyreact.py b/templates/2-scaffold/py/shinyreact.py
index c7c9769..fe82475 100644
--- a/templates/2-scaffold/py/shinyreact.py
+++ b/templates/2-scaffold/py/shinyreact.py
@@ -4,6 +4,7 @@
 from shiny.html_dependencies import shiny_deps
 from shiny.types import Jsonifiable
 from shiny.render.renderer import Renderer, ValueFn
+from shiny.module import resolve_id
 from typing import Any, Mapping, Optional, Sequence, Union
 
 
@@ -22,7 +23,6 @@ def page_react(
     css_file: str | None = "main.css",
     lang: str = "en",
 ) -> ui.Tag:
-
     head_items: list[ui.TagChild] = []
 
     if js_file:
@@ -89,6 +89,10 @@ async def post_message(session: Session, type: str, data: JsonifiableIn):
     React components using useShinyMessageHandler() hook. This wraps messages in
     a standard format and sends them via the "shinyReactMessage" channel.
 
+    When used within a Shiny module (@module.server), the type is automatically
+    namespaced using resolve_id(). Outside of modules, the type is passed through
+    unchanged.
+
     Parameters
     ----------
     session
@@ -99,4 +103,7 @@ async def post_message(session: Session, type: str, data: JsonifiableIn):
     data
         The data to send to the client
     """
-    await session.send_custom_message("shinyReactMessage", {"type": type, "data": data})
+    namespaced_type = resolve_id(type)
+    await session.send_custom_message(
+        "shinyReactMessage", {"type": namespaced_type, "data": data}
+    )
diff --git a/templates/2-scaffold/r/shinyreact.R b/templates/2-scaffold/r/shinyreact.R
index 6c5b402..6adae4f 100644
--- a/templates/2-scaffold/r/shinyreact.R
+++ b/templates/2-scaffold/r/shinyreact.R
@@ -66,14 +66,19 @@ render_json <- function(
 #' React components using useShinyMessageHandler() hook. This wraps messages in a
 #' standard format and sends them via the "shinyReactMessage" channel.
 #'
+#' When used within a Shiny module (moduleServer), the type is automatically
+#' namespaced using session$ns(). Outside of modules, the type is passed through
+#' unchanged.
+#'
 #' @param session The Shiny session object
 #' @param type The message type (should match messageType in useShinyMessageHandler)
 #' @param data The data to send to the client
 post_message <- function(session, type, data) {
+  namespaced_type <- session$ns(type)
   session$sendCustomMessage(
     "shinyReactMessage",
     list(
-      type = type,
+      type = namespaced_type,
       data = data
     )
   )