{
  "short_name": "Caturday Post",
  "name": "Caturday Post",
  "start_url": "./?utm_source=web_app_manifest",
  "icons": [
    {
      "src": "images/caticon.png",
      "sizes": "192x192",
      "type": "image/png"
    }
  ],
  "display": "standalone",
  "orientation": "portrait",
}

{
  "short_name": "Caturday Post",
  "name": "Caturday Post",
  "start_url": "./?utm_source=web_app_manifest",
  "icons": [
    {
      "src": "images/caticon.png",
      "sizes": "192x192",
      "type": "image/png"
    }
  ],
  "display": "standalone",
  "orientation": "portrait"
}

Remove trailing comma so that it is valid JSON
Remove trailing comma so that it is valid JSON