RTCPeerConnection: iceGatheringState property

The iceGatheringState read-only property of the RTCPeerConnection interface returns a string that describes the overall ICE gathering state for this connection. This lets you detect, for example, when collection of ICE candidates has finished.

You can detect when the value of this property changes by watching for an event of type icegatheringstatechange.

Note that iceGatheringState represents the overall gathering state of the connection, including every RTCIceTransport used by every RTCRtpSender and every RTCRtpReceiver on the entire connection. This contrasts with RTCIceTransport.gatheringState, which represents the gathering state for a single transport.


The possible values are:


The peer connection was just created and hasn't done any networking yet.


The ICE agent is in the process of gathering candidates for the connection.


The ICE agent has finished gathering candidates. If something happens that requires collecting new candidates, such as a new interface being added or the addition of a new ICE server, the state will revert to gathering to gather those candidates.


const pc = new RTCPeerConnection();
const state = pc.iceGatheringState;


WebRTC: Real-Time Communication in Browsers
# dom-peerconnection-ice-gathering-state

Browser compatibility

BCD tables only load in the browser

See also