Displays if the system is connected to a VPN or not.

mkdir ~/.local/share/gnome-shell/extensions/vpn-indicator

metadata.json is a required file of every extension.

• It contains basic information about the extension such as its UUID, name and description.

metadata.json

{
  "_author": "Peter Terence Roux, 2016",
  "description": "A VPN connection indicator.",
  "name": "VPN Indicator",
  "shell-version": [
    "3.36",
    "40"
  ],
  "url": "",
  "uuid": "vpn-indicator",
  "version": 1
}

https://extensions.gnome.org/

http://smasue.github.io/gnome-shell-tw