RTCPeerConnection: pendingLocalDescription property

The pendingLocalDescription read-only property of the RTCPeerConnection interface 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 the WebRTC Connectivity page.


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.

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


WebRTC: Real-Time Communication in Browsers
# dom-peerconnection-pendinglocaldesc

Browser compatibility

BCD tables only load in the browser

Note: 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