RTCDataChannel.id

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

The read-only RTCDataChannel property id returns an ID number (between 0 and 65,534) which uniquely identifies the RTCDataChannel. This ID is set at the time the data channel is created, either by the user agent (if RTCDataChannel.negotiated is false) or by the site or app script (if negotiated is true).

Each RTCPeerConnection can therefore have up to a theoretical maximum of 65,534 data channels on it, although the actual maximum may vary from browser to browser.

In early versions of the WebRTC specification, this property's name was stream. Code that uses that property needs to be updated.

Syntax

var id = aDataChannel.id;

Value

An unsigned short value (that is, an integer between 0 and 65,535) which uniquely identifies the data channel.

While the label property doesn't have to be unique, this ID number is guaranteed to be unique among all data channels. Additionally, known implementations of WebRTC use the same ID on both peers. A unique ID makes it easier for your code to do its own out-of-band data channel-related signaling.

This can be also useful for logging and debugging purposes.

Example

var pc = new RTCPeerConnection();
var dc = pc.createDataChannel("my channel");

console.log("Channel id: " + dc.id);

Specifications

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

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung 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, teoli
Last updated by: fscholz,