Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Type Array
Mandatory No

The protocol_handlers member specifies an array of objects that are protocols which this web app can register and handle. Protocol handlers register the application in an OS's application preferences; the registration associates a specific application with the given protocol scheme. For example, when using the protocol handler mailto:// on a web page, registered email applications open.

After registering a web app as a protocol handler, when a user clicks on a hyperlink with a specific scheme such as mailto:// or web+music:// from a browser or native app, the registered PWA would open and receive the URL.


In this example, a web app manifest declares that the app should be registered to handle the protocols web+jngl and web+jnglstore.

"protocol_handlers": [
    "protocol": "web+jngl",
    "url": "/lookup?type=%s"
    "protocol": "web+jnglstore",
    "url": "/shop?for=%s"

A developer can add a field in the manifest.json to declare which protocols the web app can handle. As seen in the example above, the key is named protocol_handlers and it contains an array of protocol handler declaration objects.

Registering applications to handle URL schemes is operating-system dependent. This association is usually done during application install but it can also be done afterwards from an app that has already been installed.


Protocol handlers objects may contain the following values:

Member Description
protocol A required string containing the protocol to be handled; e.g.: mailto, ms-word, web+jngl.
url Required HTTPS URL within the application scope that will handle the protocol. The %s token will be replaced by the URL starting with the protocol handler's scheme. If url is a relative URL, the base URL will be the URL of the manifest.


This feature is not part of any specification. It has been proposed to be added to the Manifest specification [1] [2].

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