The read-only component property on the RTCIceCandidate interface is a string which indicates whether the candidate is an RTP or an RTCP candidate.

If a candidate represents both RTP and RTCP multiplexed together, it is reported as an RTP candidate.


var component = RTCIceCandidate.component;


A DOMString which is "rtp" for RTP (or RTP and RTCP multiplexed together) candidates or "rtcp" for RTCP candidates.

Usage notes

Consider this SDP attribute line (a-line):

a=candidate:4234997325 1 udp 2043278322 44323 typ host

This is an ICE candidate a-line, whose foundation is 4234997325. The next field on the a-line, "1", is the component ID. A value of "1" indicates RTP, which is recorded in the component property as "rtp". If this value were instead "2", the a-line would be describing an RTCP candidate, and compoment would be "rtcp".


This code snippet examines a candidate's component type and dispatches the candidate to different handlers depending on the value.

if (candidate.component == "rtp") {
} else if (candidate.component == "rtcp") {
} else {


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

Browser compatibility

ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
componentChrome Full support 74Edge Full support ≤79Firefox No support NoIE No support NoOpera ? Safari ? WebView Android Full support 74Chrome Android Full support 74Firefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android Full support 11.0


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Compatibility unknown