RTCDataChannel.protocol

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The read-only RTCDataChannel property protocol returns a DOMString 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).

The permitted values of this property are defined by the Web site 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.

Syntax

var subProtocol = aDataChannel.protocol;

Value

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 ("").

Example

var pc = new RTCPeerConnection();
var 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;
  }
}

Specifications

Specification Status Comment
WebRTC 1.0: Real-time Communication Between Browsers
The definition of 'RTCDataChannel.protocol' in that specification.
Candidate Recommendation Initial specification.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic support
Experimental
Chrome Full support 56Edge ? Firefox No support NoIE No support NoOpera Full support 43Safari No support NoWebView Android Full support 56Chrome Android Full support 56Edge Mobile ? Firefox Android No support NoOpera Android Full support 43Safari iOS ? Samsung Internet Android Full support 6.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.

See also

Document Tags and Contributors

Contributors to this page: fscholz, jpmedley, Sheppy, Jib, teoli
Last updated by: fscholz,