The sendReport() method of the HIDDevice interface sends an output report to the HID device.

The reportId for each of the report formats that this device supports can be retrieved from HIDDevice.collections.

reportId

An 8-bit report ID. If the HID device does not use report IDs, send 0.

data

Bytes as an ArrayBuffer, a TypedArray, or a DataView.

A Promise that resolves with undefined once the report has been sent.

NotAllowedError DOMException

Thrown if sending the report fails for any reason.

The example below shows how to make a Joy-Con device rumble using output reports. You can see more examples, and live demos in the article Connecting to uncommon HID devices.

// First, send a command to enable vibration.
// Magical bytes come from https://github.com/mzyy94/joycon-toolweb
const enableVibrationData = [1, 0, 1, 64, 64, 0, 1, 64, 64, 0x48, 0x01];
await device.sendReport(0x01, new Uint8Array(enableVibrationData));

// Then, send a command to make the Joy-Con device rumble.
// Actual bytes are available in the sample.
const rumbleData = [
  /* … */
];
await device.sendReport(0x10, new Uint8Array(rumbleData));