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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/RTCDataChannel/protocol below:

RTCDataChannel: protocol property - Web APIs

Baseline Widely available

The read-only RTCDataChannel property protocol returns a string containing the name of the subprotocol in use. If no protocol was specified when the data channel was created, then this property's value is the empty string ("").

Note: The permitted values of this property are defined by the website or app using the data channel.

The ability for each channel to have a defined subprotocol lets your app, for example, use JSON objects as messages on one channel while another channel is plaintext and another is raw binary or even some other format.

A string identifying the app-defined subprotocol being used for exchanging data on the channel. If none has been established, this is an empty string ("").

const pc = new RTCPeerConnection();
const dc = pc.createDataChannel("my channel", {
  protocol: "json",
});

function handleChannelMessage(dataChannel, msg) {
  switch (dataChannel.protocol) {
    case "json":
      /* process JSON data */
      break;
    case "raw":
      /* process raw binary data */
      break;
  }
}

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