js

const device = await navigator.hid.requestDevice({ filters: [] });
// A popup titled `... wants to connect to a HID Device` with `Cancel` and `Connect` buttons will show up with a device list to select from.
// Select one and click on `Connect` button. Then the device will be an array with the selected device in it.

js

let devices = await navigator.hid.getDevices();
devices.forEach((device) => {
  console.log(`HID: ${device.productName}`);
});

js

navigator.hid.addEventListener("disconnect", (event) => {
  console.log(`HID disconnected: ${event.device.productName}`);
  console.dir(event);
});
// For example, when my connected keyboard gets disconnected, the log in the console will show:
// HID disconnected: USB Keyboard
// {
//    bubbles: false
//    cancelBubble: false
//    cancelable: false
//    composed: false
//    currentTarget: HID {onconnect: null, ondisconnect: null}
//    defaultPrevented: false
//    device: HIDDevice {oninputreport: null, opened: false, vendorId: 6700, productId: 11555, productName: "USB Keyboard", …}
//    eventPhase: 0
//    isTrusted: true
//    path: []
//    returnValue: true
//    srcElement: HID {onconnect: null, ondisconnect: null}
//    target: HID {onconnect: null, ondisconnect: null}
//    timeStamp: 18176.600000023842
//    type: "disconnect"
// }

// The event above is an instance of the HIDConnectionEvent interface.