This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The read-only RTCDataChannel property ordered indicates whether or not the data channel guarantees in-order delivery of messages; the default is true, which indicates that the data channel is indeed ordered. This is set when the RTCDataChannel is created, by setting the ordered property on the RTCDataChannelInit object passed as RTCPeerConnection.createDataChannel()'s options parameter.


var ordered = aDataChannel.ordered;

A Boolean value which is true if in-order delivery is guaranteed and is otherwise false.


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

if (!dc.ordered) {
  // Handle unordered messaging


Specification Status Comment
WebRTC 1.0: Real-time Communication Between Browser
The definition of 'RTCDataChannel.ordered' in that specification.
Working Draft Initial specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) 24 (24) [1] No support (Yes) ?
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support 28 [2] 24.0 (24) [1] No support No support No support (Yes)

[1] The interface is called DataChannel and not RTCDataChannel in Firefox. However, a binding has been in place since Firefox 24 so that either name will work.

[2] WebRTC, including RTCDataChannel, was introduced in Chrome 28 for Android behind a flag, and enabled by default starting in Chrome 29 for Android.

See also

Document Tags and Contributors

 Contributors to this page: Sheppy, teoli
 Last updated by: Sheppy,