{
 "name": "Djacket",
 "icons": [
  {
   "src": "\/android-icon-36x36.png",
   "sizes": "36x36",
   "type": "image\/png",
   "density": "0.75"
  },
 ]
}
{
 "name": "Djacket",
 "icons": [
  {
   "src": "/android-icon-36x36.png",
   "sizes": "36x36",
   "type": "image/png"
  },
 ]
}

Remove unnecessary escapes + density
Remove unnecessary escapes + density 

There is no need to escape the strings for URLs or MIME type in the manifest. Additionally, a density of "0.75" won't ever match any device.