Where do I put manifest JSON?
Web app manifests are deployed in your HTML pages using a <link>
element in the <head>
of a document:
<link rel="manifest" href="/manifest.json">
The .webmanifest extension is specified in the Media
type registration section of the specification (the response of the manifest file should return
Content-Type: application/manifest+json). Browsers generally support manifests with other
appropriate extensions like .json (Content-Type: application/json).
If the manifest requires credentials to fetch, the crossorigin
attribute must be
set to use-credentials, even if the manifest file is in the same origin as the current page.
<link rel="manifest" href="/app.webmanifest" crossorigin="use-credentials">