The applicationServerKey option is used by the user agent when establishing a push subscription with a push service. This is the key that the application server will use to authenticate itself when sending push messages to this push subscription. Currently, applicationServerKey only supports BufferSource in Chrome. After this change, it can also accept a base64url encoded value.



Specification link

Specification currently under development in a Working Group

Status in Chromium


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.


Last updated on 2021-12-13