Web/API/RTCDataChannel/id

This is an experimental technologyCheck 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 BrowsersThe definition of 'RTCDataChannel.id' in that specification.	Candidate Recommendation	Initial specification.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`id` Experimental'	Chrome Full support 56	Edge Full support ≤79	Firefox No support No	IE No support No	Opera Full support 43	Safari No support No	WebView Android Full support 56	Chrome Android Full support 56	Firefox Android No support No	Opera Android Full support 43	Safari iOS No support No	Samsung Internet Android Full support 6.0

Legend

Full support: Full support
No support: No support
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.