diff --git a/jsoncanvas.schema.json b/jsoncanvas.schema.json
index 4742ed3..62bf77a 100644
--- a/jsoncanvas.schema.json
+++ b/jsoncanvas.schema.json
@@ -1,41 +1,31 @@
 {
 	"$schema": "http://json-schema.org/draft-07/schema#",
-	"default": {
-		"edges": [],
-		"nodes": []
-	},
-	"properties": {
-		"required": true,
-		"edges": {
-			"items": {
-				"$ref": "#/definitions/JSONCanvasEdge"
-			},
-			"type": "array"
-		},
-		"nodes": {
-			"items": {
-				"$ref": "#/definitions/JSONCanvasNode"
-			},
-			"type": "array"
-		}
-	},
+	"$ref": "#/definitions/JsonCanvas",
 	"definitions": {
-		"JSONCanvasColor": {
-			"anyOf": [
-				{
-					"type": "string"
-				},
-				{
-					"$ref": "#/definitions/JSONCanvasColorPreset"
+		"JsonCanvas": {
+			"type": "object",
+			"properties": {
+				"required": {
+					"type": "boolean",
+					"const": true
+				},
+				"edges": {
+					"type": "array",
+					"items": {
+						"$ref": "#/definitions/JSONCanvasEdge"
+					}
+				},
+				"nodes": {
+					"type": "array",
+					"items": {
+						"$ref": "#/definitions/JSONCanvasNode"
+					}
 				}
-			]
-		},
-		"JSONCanvasColorPreset": {
-			"enum": [1, 2, 3, 4, 5, 6],
-			"type": "number"
+			},
+			"additionalProperties": {}
 		},
 		"JSONCanvasEdge": {
-			"additionalProperties": false,
+			"type": "object",
 			"properties": {
 				"color": {
 					"$ref": "#/definitions/JSONCanvasColor"
@@ -62,38 +52,89 @@
 					"$ref": "#/definitions/JSONCanvasEdgeSide"
 				}
 			},
-			"required": ["id", "fromNode", "toNode"],
-			"type": "object"
+			"required": [
+				"fromNode",
+				"id",
+				"toNode"
+			],
+			"additionalProperties": false
 		},
-		"JSONCanvasEdgeEnd": {
-			"enum": ["none", "arrow"],
-			"type": "string"
+		"JSONCanvasColor": {
+			"anyOf": [
+				{
+					"type": "string"
+				},
+				{
+					"$ref": "#/definitions/JSONCanvasColorPreset"
+				}
+			]
+		},
+		"JSONCanvasColorPreset": {
+			"type": "number",
+			"enum": [
+				1,
+				2,
+				3,
+				4,
+				5,
+				6
+			]
 		},
 		"JSONCanvasEdgeSide": {
-			"enum": ["top", "right", "bottom", "left"],
-			"type": "string"
+			"type": "string",
+			"enum": [
+				"top",
+				"right",
+				"bottom",
+				"left"
+			]
 		},
-		"JSONCanvasFileNode": {
-			"additionalProperties": false,
+		"JSONCanvasEdgeEnd": {
+			"type": "string",
+			"enum": [
+				"none",
+				"arrow"
+			]
+		},
+		"JSONCanvasNode": {
+			"anyOf": [
+				{
+					"$ref": "#/definitions/JSONCanvasNodeType"
+				},
+				{
+					"$ref": "#/definitions/JSONCanvasTextNode"
+				},
+				{
+					"$ref": "#/definitions/JSONCanvasFileNode"
+				},
+				{
+					"$ref": "#/definitions/JSONCanvasLinkNode"
+				},
+				{
+					"$ref": "#/definitions/JSONCanvasGroupNode"
+				}
+			]
+		},
+		"JSONCanvasNodeType": {
+			"type": "object",
 			"properties": {
 				"color": {
 					"$ref": "#/definitions/JSONCanvasColor"
 				},
-				"file": {
-					"type": "string"
-				},
 				"height": {
 					"type": "number"
 				},
 				"id": {
 					"type": "string"
 				},
-				"subpath": {
-					"type": "string"
-				},
 				"type": {
-					"const": "file",
-					"type": "string"
+					"type": "string",
+					"enum": [
+						"text",
+						"file",
+						"link",
+						"group"
+					]
 				},
 				"width": {
 					"type": "number"
@@ -105,19 +146,19 @@
 					"type": "number"
 				}
 			},
-			"required": ["file", "height", "id", "type", "width", "x", "y"],
-			"type": "object"
+			"required": [
+				"height",
+				"id",
+				"type",
+				"width",
+				"x",
+				"y"
+			],
+			"additionalProperties": false
 		},
-		"JSONCanvasGroupNode": {
-			"additionalProperties": false,
+		"JSONCanvasTextNode": {
+			"type": "object",
 			"properties": {
-				"background": {
-					"type": "string"
-				},
-				"backgroundStyle": {
-					"enum": ["cover", "ratio", "repeat"],
-					"type": "string"
-				},
 				"color": {
 					"$ref": "#/definitions/JSONCanvasColor"
 				},
@@ -127,12 +168,12 @@
 				"id": {
 					"type": "string"
 				},
-				"label": {
+				"text": {
 					"type": "string"
 				},
 				"type": {
-					"const": "group",
-					"type": "string"
+					"type": "string",
+					"const": "text"
 				},
 				"width": {
 					"type": "number"
@@ -144,27 +185,38 @@
 					"type": "number"
 				}
 			},
-			"required": ["height", "id", "type", "width", "x", "y"],
-			"type": "object"
+			"required": [
+				"height",
+				"id",
+				"text",
+				"type",
+				"width",
+				"x",
+				"y"
+			],
+			"additionalProperties": false
 		},
-		"JSONCanvasLinkNode": {
-			"additionalProperties": false,
+		"JSONCanvasFileNode": {
+			"type": "object",
 			"properties": {
 				"color": {
 					"$ref": "#/definitions/JSONCanvasColor"
 				},
+				"file": {
+					"type": "string"
+				},
 				"height": {
 					"type": "number"
 				},
 				"id": {
 					"type": "string"
 				},
-				"type": {
-					"const": "link",
+				"subpath": {
 					"type": "string"
 				},
-				"url": {
-					"type": "string"
+				"type": {
+					"type": "string",
+					"const": "file"
 				},
 				"width": {
 					"type": "number"
@@ -176,30 +228,19 @@
 					"type": "number"
 				}
 			},
-			"required": ["height", "id", "type", "url", "width", "x", "y"],
-			"type": "object"
+			"required": [
+				"file",
+				"height",
+				"id",
+				"type",
+				"width",
+				"x",
+				"y"
+			],
+			"additionalProperties": false
 		},
-		"JSONCanvasNode": {
-			"anyOf": [
-				{
-					"$ref": "#/definitions/JSONCanvasNodeType"
-				},
-				{
-					"$ref": "#/definitions/JSONCanvasTextNode"
-				},
-				{
-					"$ref": "#/definitions/JSONCanvasFileNode"
-				},
-				{
-					"$ref": "#/definitions/JSONCanvasLinkNode"
-				},
-				{
-					"$ref": "#/definitions/JSONCanvasGroupNode"
-				}
-			]
-		},
-		"JSONCanvasNodeType": {
-			"additionalProperties": false,
+		"JSONCanvasLinkNode": {
+			"type": "object",
 			"properties": {
 				"color": {
 					"$ref": "#/definitions/JSONCanvasColor"
@@ -211,7 +252,10 @@
 					"type": "string"
 				},
 				"type": {
-					"enum": ["text", "file", "link", "group"],
+					"type": "string",
+					"const": "link"
+				},
+				"url": {
 					"type": "string"
 				},
 				"width": {
@@ -224,12 +268,31 @@
 					"type": "number"
 				}
 			},
-			"required": ["id", "type", "x", "y", "width", "height"],
-			"type": "object"
+			"required": [
+				"height",
+				"id",
+				"type",
+				"url",
+				"width",
+				"x",
+				"y"
+			],
+			"additionalProperties": false
 		},
-		"JSONCanvasTextNode": {
-			"additionalProperties": false,
+		"JSONCanvasGroupNode": {
+			"type": "object",
 			"properties": {
+				"background": {
+					"type": "string"
+				},
+				"backgroundStyle": {
+					"type": "string",
+					"enum": [
+						"cover",
+						"ratio",
+						"repeat"
+					]
+				},
 				"color": {
 					"$ref": "#/definitions/JSONCanvasColor"
 				},
@@ -239,12 +302,12 @@
 				"id": {
 					"type": "string"
 				},
-				"text": {
+				"label": {
 					"type": "string"
 				},
 				"type": {
-					"const": "text",
-					"type": "string"
+					"type": "string",
+					"const": "group"
 				},
 				"width": {
 					"type": "number"
@@ -256,8 +319,15 @@
 					"type": "number"
 				}
 			},
-			"required": ["height", "id", "text", "type", "width", "x", "y"],
-			"type": "object"
+			"required": [
+				"height",
+				"id",
+				"type",
+				"width",
+				"x",
+				"y"
+			],
+			"additionalProperties": false
 		}
 	}
 }