The nackCount property of the RTCOutboundRtpStreamStats dictionary is a numeric value indicating the number of times the RTCRtpSender described by this object received a NACK packet from the remote receiver. A NACK (Negative ACKnowledgement, also called "Generic NACK") packet is used by the RTCRtpReceiver to inform the sender that one or more RTP packets it sent were lost in transport.


var nackCount = RTCOutboundRtpStreamStats.nackCount;


An integer value indicating how many times the sender received a NACK packet from the receiver, indicating the loss of one or more packets.


Specification Status Comment
Identifiers for WebRTC's Statistics API
The definition of 'RTCOutboundRtpStreamStats.nackCount' in that specification.
Candidate Recommendation Initial definition.

Browser compatibility

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