Error when load model in gojs

GoJS
1

Hi, I have a model which from this.myDiagram.model.toJson():

{ "class": "TreeModel",\n  "nodeDataArray": [\n{"category":"Main","key":"main","name":"xx","department":"xx","class":null,"source":"http://52.83.94.142:8866/image//9/20210906171223268_img103.png","loc":"50 70.8291015625"},\n{"category":"text","text":"设计","class":0,"parent":"main","key":-2,"loc":"202.76142374915398 70.8291015625"},\n{"category":"text","text":"视觉/交互设计","class":1,"parent":-2,"key":-3,"loc":"358.2842712474619 70.8291015625"},\n{"category":"text","text":"视觉设计","class":2,"parent":-3,"key":-4,"loc":"513.8071187457699 70.8291015625"},\n{"category":"icon","class":4,"source":"img/1.9c881058.png","parent":-4,"key":-5,"loc":"655.0685424949238 70.8291015625"}\n]}

When I call this.myDiagram.model = go.Model.fromJson(this.model); it throw error:
Snip20210908_16
Can you help with this, thank you for your time!

2

The “\n” characters in your string are not valid JSON syntax.

Don’t use the property name “class” in what you pass to Model.fromJson.