diff --git a/public/config/default-display-config.schema.json b/public/config/default-display-config.schema.json
new file mode 100644
index 0000000..5c3a085
--- /dev/null
+++ b/public/config/default-display-config.schema.json
@@ -0,0 +1,89 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "type": "object",
+  "patternProperties": {
+    "^_icon$": {
+      "type": "string"
+    },
+    "^_color$": {
+      "type": "string"
+    },
+    "^_labelTemplates$": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      }
+    },
+    "^_states$": {
+      "$ref": "#/definitions/nestedObjects"
+    },
+    "^[a-zA-Z0-9][a-zA-Z0-9_]+$": {
+      "type": "object",
+      "properties": {
+        "icon": {
+          "type": "string"
+        },
+        "color": {
+          "type": "string"
+        },
+        "labelTemplates": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "states": {
+          "$ref": "#/definitions/nestedObjects"
+        },
+        "classes": {
+          "$ref": "#/definitions/nestedObjects"
+        }
+      },
+      "additionalProperties": false,
+      "required": [],
+      "optional": [
+        "icon",
+        "color",
+        "labelTemplates",
+        "states",
+        "classes"
+      ]
+    }
+  },
+  "additionalProperties": false,
+  "definitions": {
+    "nestedObjects": {
+      "type": "object",
+      "patternProperties": {
+        "^[a-zA-Z0-9_]+$": {
+          "type": "object",
+          "properties": {
+            "icon": {
+              "type": "string"
+            },
+            "color": {
+              "type": "string"
+            },
+            "labelTemplates": {
+              "type": "array",
+              "items": {
+                "type": "string"
+              }
+            },
+            "states": {
+              "$ref": "#/definitions/nestedObjects"
+            }
+          },
+          "additionalProperties": false,
+          "required": [],
+          "optional": [
+            "icon",
+            "color",
+            "labelTemplates",
+            "states"
+          ]
+        }
+      }
+    }
+  }
+}
diff --git a/public/config/default-display-config.yml b/public/config/default-display-config.yml
index 561c5f2..15af1e6 100644
--- a/public/config/default-display-config.yml
+++ b/public/config/default-display-config.yml
@@ -21,9 +21,8 @@
 
 _color: "#a1a1a1"
 _labelTemplates:
-  -
-  -
-  -
+  - ""
+  - ""
   - "{{state}}{{unit_of_measurement}}"
 _states:
   unavailable:
@@ -59,11 +58,13 @@ binary_sensor:
     plug:
       icon: mdi:power-plug-off-outline
       states:
-        on: mdi:power-plug-outline
+        on:
+          icon: mdi:power-plug-outline
     window:
       icon: mdi:window-closed-variant
       states:
-        on: mdi:window-open-variant
+        on:
+          icon: mdi:window-open-variant
 
 cover:
   icon: mdi:garage