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This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.

This API is available on Firefox OS for privileged or certified applications only.


The onconnect property is used to specify a callback handler to deal with new incoming connections. This callback is called each time a client connection is accepted.

The data attribute of the event object passed to the onconnect handler is a TCPSocket instance, which is used for communication between client and server.


instanceOfTCPServerSocket.onconnect = funcRef

Where funcRef is a function to be called on any new incoming connection.

This callback function will get an event object as its first parameter with a data property, which is a TCPSocket object.


var server = navigator.mozTCPSocket.listen(-1);

server.onconnect = function (socket) {
  socket.send('Welcome to this App');


Not part of any specification yet; however, this API is discussed at W3C as part of the System Applications Working Group under the Raw Sockets proposal.

See also

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Contributors to this page: kscarfone, teoli, Jeremie
Last updated by: kscarfone,