The RTCIceCandidate interface's read-only type specifies the type of candidate the object represents.

The type field's value is set when the RTCIceCandidate() constructor is used. You can't specify the value of type in the options object, but the address is automatically extracted from the candidate a-line, if it's formatted properly, being taken from its cand-type field.


var type = RTCIceCandidate.type;


A DOMString whose value is one of those defined by the RTCIceCandidateType enumerated type.

These candidate types are listed in order of priority; the higher in the list they are, the more efficient they are.

The candidate is a host candidate, whose IP address as specified in the RTCIceCandidate.ip property is in fact the true address of the remote peer.
The candidate is a server reflexive candidate; the ip indicates an intermediary address assigned by the STUN server to represent the candidate's peer anonymously.
The candidate is a peer reflexive candidate; the ip is an intermediary address assigned by the STUN server to represent the candidate's peer anonymously.
The candidate is a relay candidate, obtained from a TURN server. The relay candidate's IP address is an address the TURN server uses to forward the media between the two peers.

If type is null, that information was missing from the candidate's a-line, which will cause RTCPeerConnection.addIceCandidate() to throw an OperationError exception.


In this example, the candidate's type is used to present a modified user interface for host candidates (those where the ip refers directly to the remote peer, rather than an intermediary).

if (candidate.type == "host") {
} else {


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

Browser compatibility

ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
typeChrome Full support 74Edge Full support ≤18Firefox No support NoIE No support NoOpera No support NoSafari ? WebView Android Full support 74Chrome Android Full support 74Firefox Android No support NoOpera Android No support NoSafari iOS ? Samsung Internet Android Full support 11.0


Full support
Full support
No support
No support
Compatibility unknown
Compatibility unknown

See also