category.js

var attr = DS.attr;
var hasMany = DS.hasMany;
var belongsTo = DS.belongsTo;

var Category = DS.Model.extend({
  title: attr(),
  displayHint: attr(),
  categoryList: hasMany('category', {inverse: 'parent'}),
  parent: belongsTo('category', {inverse: 'categoryList'})
});

export default Category;

response.json

{
  "status": "success",
  "message": "success",
  "messageCode": null,
  "data": {
    "categories": [
      {
        "categoryId": 1,
        "title": "title",
        "displayHint": null,
        "categoryList": [
          {
            "categoryId": 2,
            "title": "title",
            "displayHint": "displayHint",
            "categoryList": [
              {
                "categoryId": 298,
                "title": "title",
                "displayHint": "displayHint",
                "categoryList": []
              },
              {
                "categoryId": 332,
                "title": "title",
                "displayHint": "displayHint",
                "categoryList": []
              },
              {
                "categoryId": 299,
                "title": "title",
                "displayHint": "displayHint",
                "categoryList": []
              },
              {
                "categoryId": 300,
                "title": "title",
                "displayHint": "displayHint",
                "categoryList": []
              },
              {
                "categoryId": 314,
                "title": "title",
                "displayHint": "displayHint",
                "categoryList": []
              }
            ]
          }
        ]
      }
    ]
  }
}