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A simple file sharing application using
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Latest commit e65fbb5 Mar 3, 2014
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client FF<--> Chrome && major file handling update Feb 23, 2014
server further license update Nov 9, 2013 Update Mar 2, 2014


Using the library to create a IM/filesharing website. Tested & working in Chrome, Firefox & Opera.

WebRTC Connection Note

This website does require a reliable WebRTC connection, which is only supported in Chrome, Firefox & Opera.

Communication between Chrome & Opera is working.

Communication between Firefox and Chrome/Opera is working.

File IO note

At no point is data stored in the browsers memory. This code will write and read directly from disk, except Firefox which cannot write directly to disk. This is because we must use [idb.filesystem.js] ( to mimic the HTML5 FileSystem API for Firefox. It's one limitation is that we cannot provide the user with a file link directly from this (like we can with Chrome). So we must instead write to it, then grab the file as a blob and place it into JS memory so the user can then download it to their local file system.

WebRTC datachannel note

Each chunk of a file is requested by the receiving end (a file is divided into many 256k chunks), only after the previous chunk has been received (each chunk is sent over in smaller 16k pieces). This is done this way because, there is no way easily send large amounts of data without first dividing it up further, see:

Additional crypto/OTR information

OTR has been disabled on It is not safe to trust a 3rd party server to deliver cryptographic code. In order to use this feature, please host at least the client portion of the site yourself. Also, OTR is likely no longer needed to add authentication. This is because, during the initial SDP negotiation, a fingerprint of each peer's key is communicated. As long as the connection to the signaling server is secure & the signaling server is trustworthy, authentication can be guaranteed.

For details on the OTR implementation see: (notes on insecurity of WebRTC on this page might be incorrect)


(currently hosted on Ubuntu, but any linux server will likely work)

Copy client directory to web server public directory (ie. /var/www/)

Copy the server directory to a non-public folder (ie. your user folder ~/)

To start the server:

npm install ws express
node ~/server/site/server.js (or use the forever node.js module to keep it running)
or for secure/wss: 
node ~/server/site/server-secure.js (or use the forever node.js module to keep it running)

That's it!


Copyright (C) 2013-2014 [Samuel Erb] (

webRTCCopy is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

webRTCCopy is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <>.

Prior to 11/9/2013 this work was licensed under a [Creative Commons Attribution-ShareAlike 3.0 Unported License] ( This is an incorrect license to use for a software project (see ).

Originally based on [] ( developed by: @dennismatensson @cavedweller @sarenji

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