RTCPeerConnection: localDescription property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

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

Value

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 the WebRTC Connectivity page for details on this algorithm and why it's used.

Example

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

js
const pc = new RTCPeerConnection();
// ...
const sd = pc.localDescription;
if (sd) {
  alert(`Local session: type='${sd.type}'; sdp description='${sd.sdp}'`);
} else {
  alert("No local session yet.");
}

Specifications

Specification
WebRTC: Real-Time Communication in Browsers
# dom-peerconnection-localdescription

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
localDescription

Legend

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Full support
Full support

See also