Progressive Web App : manifest.json simple example.

manifest.json

/**********
manifest.json - remove this comment before using, as JSON files don't support comments.
---------------
Simple progressive web app configuration file.
Prompts user to download app outside the stores on mobile browser.
---------------
Requires SSL enabled and service workers. Test your project for PWA using lighthouse :
https://developers.google.com/web/tools/lighthouse/
**********/
{
  "manifest_version":1,
  "name": "myapp",
  "version":"1.0",
  "short_name": "MA",
  "lang": "en-US",
  "start_url": "/",
  "homepage_url": "/",
  "display": "fullscreen",
  "orientation": "portrait",
  "offline_enabled": true,
  "theme_color": "#FFF",
  "icons": [
    {
      "src": "static/icon-192x192.png",
      "sizes": "192x192",
      "type": "image/png"
    },
    {
      "src": "static/icon-512x512.png",
      "sizes": "512x512",
      "type": "image/png"
    }
  ],
  "prefer_related_applications": true,
  "related_applications": [
    {
      "platform": "play",
      "url": "https://play.google.com/store/apps/details?id=com.my.app",
      "id": "com.my.app",
      "min_version": "1",
      "fingerprints": [
        {
          "type": "sha256_cert",
          "value": "92:5A:39:05:C5:B9:EA:BC:71:48:5F:F2"
        }
      ]
    },
    {
      "platform": "itunes",
      "url": "https://itunes.apple.com/app/my-app/id123456789"
    }
  ],
  "background_color": "#FAFAFA",
  "screenshots": [
    {
      "src": "screen1"
    },
    {
      "src": "screen2"
    },
    {
      "src": "screen3"
    }
  ]
}