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 property RTCPeerConnection.pendingLocalDescription returns an RTCSessionDescription object describing a pending configuration change for the local end of the connection. This does not describe the connection as it currently stands, but as it may exist in the near future. Use RTCPeerConnection.currentLocalDescription or RTCPeerConnection.localDescription to get the current state of the endpoint. For details on the difference, see "Pending and current descriptions" in WebRTC connectivity.


var sessionDescription = peerConnection.pendingLocalDescription;

Return value

If a local description change is in progress, this is an RTCSessionDescription describing the proposed configuration. Otherwise, this returns null.


This example looks at the pendingLocalDescription to determine whether or not there's a description change being processed.

var pc = new RTCPeerConnection();
var sd = pc.pendingLocalDescription;
if (sd) {
  // There's a description change underway!
else {
  // No description change pending


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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support No support No support No support No support No support
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support No support No support No support No support No support

The addition of pendingLocalDescription and currentLocalDescription to the WebRTC spec is relatively recent. In browsers which don't support them, only localDescription is available.

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

Experimental pendingLocalDescription Property Reference RTCPeerConnection WebRTC