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 TCPServerSocket interface provides an API to handle a persistent server that will listen for incoming connections on a given port.

Note: Only certified apps can accept incoming connections on a port below 1024.

API overview

interface TCPServerSocket{
  readonly attribute unsigned short localPort;

  void close();

  attribute onconnect;
  attribute onerror;


TCPServerSocket.localPort Read only
A number representing the port the server socket is listening to.

Events handler

A handler called when an incoming client connection is accepted.
A handler called when the listen of a server socket is aborted.


Closes the server socket.


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

Document Tags and Contributors

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