document.json

{
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  "assets": {
    "_class": "assetCollection",
    "colorAssets": [],
    "gradientAssets": [],
    "imageCollection": { "_class": "imageCollection", "images": {} },
    "images": [],
    "colors": [],
    "gradients": []
  },
  "colorSpace": 0,
  "currentPageIndex": 0,
  "foreignLayerStyles": [],
  "foreignSymbols": [],
  "foreignTextStyles": [],
  "layerStyles": { "_class": "sharedStyleContainer", "objects": [] },
  "layerSymbols": { "_class": "symbolContainer", "objects": [] },
  "layerTextStyles": { "_class": "sharedTextStyleContainer", "objects": [] },
  "pages": [
    {
      "_class": "MSJSONFileReference",
      "_ref_class": "MSImmutablePage",
      "_ref": "pages/204B1B79-130F-4060-BF38-3F2ED7DA8DA9"
    }
  ]
}