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

The read-only property RTCPeerConnection.localDescription returns an RTCSessionDescription describing the session for the local end of the connection. If it has not yet been set, this is null.


 var sessionDescription = peerConnection.localDescription;

On a more fundamental level, the returned value is the value of RTCPeerConnection.pendingLocalDescription if that property isn't null; otherwise, the value of RTCPeerConnection.currentLocalDescription is returned. See Pending and current descriptions in WebRTC connectivity for details on this algorithm and why it's used.


This example looks at the localDescription and displays an alert containing the RTCSessionDescription object's type and sdp fields.

var pc = new RTCPeerConnection();
var sd = pc.localDescription;
if (sd) {
  alert("Local session: type='" +         
        sd.type + "'; sdp description='" +
        sd.sdp + "'");
else {
  alert("No local session yet.");


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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support561522 ?


37 — 43

FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support5656 Yes44


37 — 43


1. Promise based version.

See also

Document Tags and Contributors

Contributors to this page: fscholz, jpmedley, abbycar, themichaelyang, Sheppy, teoli
Last updated by: fscholz,