diff --git a/homeassistant/components/zwave_js/api.py b/homeassistant/components/zwave_js/api.py
index 12ec66906a8..599183eba7e 100644
--- a/homeassistant/components/zwave_js/api.py
+++ b/homeassistant/components/zwave_js/api.py
@@ -106,7 +106,12 @@ def websocket_node_status(
     entry_id = msg[ENTRY_ID]
     client = hass.data[DOMAIN][entry_id][DATA_CLIENT]
     node_id = msg[NODE_ID]
-    node = client.driver.controller.nodes[node_id]
+    node = client.driver.controller.nodes.get(node_id)
+
+    if node is None:
+        connection.send_error(msg[ID], ERR_NOT_FOUND, f"Node {node_id} not found")
+        return
+
     data = {
         "node_id": node.node_id,
         "is_routing": node.is_routing,
@@ -354,7 +359,12 @@ def websocket_get_config_parameters(
     entry_id = msg[ENTRY_ID]
     node_id = msg[NODE_ID]
     client = hass.data[DOMAIN][entry_id][DATA_CLIENT]
-    node = client.driver.controller.nodes[node_id]
+    node = client.driver.controller.nodes.get(node_id)
+
+    if node is None:
+        connection.send_error(msg[ID], ERR_NOT_FOUND, f"Node {node_id} not found")
+        return
+
     values = node.get_configuration_values()
     result = {}
     for value_id, zwave_value in values.items():
diff --git a/tests/components/zwave_js/test_api.py b/tests/components/zwave_js/test_api.py
index dcbd924c86e..9760e1a06b7 100644
--- a/tests/components/zwave_js/test_api.py
+++ b/tests/components/zwave_js/test_api.py
@@ -6,6 +6,7 @@ from zwave_js_server.const import LogLevel
 from zwave_js_server.event import Event
 from zwave_js_server.exceptions import InvalidNewValue, NotFoundError, SetValueFailed
 
+from homeassistant.components.websocket_api.const import ERR_NOT_FOUND
 from homeassistant.components.zwave_js.api import (
     CONFIG,
     ENABLED,
@@ -76,6 +77,32 @@ async def test_websocket_api(hass, integration, multisensor_6, hass_ws_client):
     assert result[key]["configuration_value_type"] == "enumerated"
     assert result[key]["metadata"]["states"]
 
+    # Test getting non-existent node fails
+    await ws_client.send_json(
+        {
+            ID: 5,
+            TYPE: "zwave_js/node_status",
+            ENTRY_ID: entry.entry_id,
+            NODE_ID: 99999,
+        }
+    )
+    msg = await ws_client.receive_json()
+    assert not msg["success"]
+    assert msg["error"]["code"] == ERR_NOT_FOUND
+
+    # Test getting non-existent node config params fails
+    await ws_client.send_json(
+        {
+            ID: 6,
+            TYPE: "zwave_js/get_config_parameters",
+            ENTRY_ID: entry.entry_id,
+            NODE_ID: 99999,
+        }
+    )
+    msg = await ws_client.receive_json()
+    assert not msg["success"]
+    assert msg["error"]["code"] == ERR_NOT_FOUND
+
 
 async def test_add_node(
     hass, integration, client, hass_ws_client, nortek_thermostat_added_event