A database for concurrent document editing

npm install share
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You are looking at the 0.7 alpha branch of ShareJS.

Welcome. So you know, this code might spontaniously catch fire. Both the API and the code are unstable and will to change and crash on you. Test coverage has dropped from 90% in ShareJS 0.6 to around 30% and documentation of the new APIs is almost nonexistant.

The documentation below is also full of lies. If you want to play with the new version of ShareJS anyway, look at the examples in prototype/.

I understand that if you're using racer & derby, you will use this code anyway despite my warnings. YOU WILL RUN INTO BUGS.

This is a little server (& client library) to allow concurrent editing of any kind of content. The server runs on NodeJS and the client works in NodeJS or a web browser.

ShareJS currently supports operational transform on plain-text and arbitrary JSON data.

Immerse yourself in API Documentation.

Visit Google groups for discussions and announcements

Check out the live interactive demos.

Note: CI sometimes breaks for random reasons even though the tests work locally. Don't stress! Build Status

Browser support

ShareJS should work with all of them logos of all of all the browsers

That said, I only test regularly with FF, Safari and Chrome, and occasionally with IE8+. File bug reports if you have issues

Installing and running

# npm install share

Run the examples with:

# sharejs-exampleserver

If you want redis support, you'll need to install redis:

# brew install redis
# npm install -g redis

From source

Install redis (optional)

  • Mac:

      # brew install redis
  • Linux:

      # sudo apt-get install redis


# git clone git://
# cd ShareJS
# npm install redis   # If you want redis support
# npm link

Run the tests:

# cake test

Build the coffeescript into .js:

# cake build
# cake webclient

Run the example server:

# bin/exampleserver

Running a server

There are two ways to run a sharejs server:

  1. Embedded in a node.js server app:

     var connect = require('connect'),
         sharejs = require('share').server;
     var server = connect(
           connect.static(__dirname + '/my_html_files')
     var options = {db: {type: 'none'}}; // See docs for options. {type: 'redis'} to enable persistance.
     // Attach the sharejs REST and interfaces to the server
     sharejs.attach(server, options);
     console.log('Server running at');

    The above script will start up a ShareJS server on port 8000 which hosts static content from the my_html_files directory. See bin/exampleserver for a more complex configuration example.

    See the Connect or Express documentation for more complex routing.

  2. From the command line:

     # sharejs

    Configuration is pulled from a configuration file that can't be easily edited at the moment. For now, I recommend method #1 above.

  3. If you are just mucking around, run:

     # sharejs-exampleserver

    This will run a simple server on port 8000, and host all the example code there. Run it and check out http://localhost:8000/ . The example server stores everything in ram, so don't get too attached to your data.

    If you're running sharejs from source, you can launch the example server by running bin/exampleserver.

Putting Share.js on your website

If you want to get a simple editor working in your webpage with sharejs, here's what you need to do:

First, get an ace editor on your page:

<div id="editor"></div>

Your web app will need access to the following JS files:

Add these script tags:

<script src=""></script>
<script src="/channel/bcsocket.js"></script>
<script src="/share/share.js"></script>
<script src="/share/ace.js"></script>

And add this code:

    var editor = ace.edit("editor");'hello', 'text', function(error, doc) {

NOTE: If you're using the current version in npm (0.4) or earler, the argument order is the other way around (function(doc, error)).

Thats about it :)

The easiest way to get your code running is to check sharejs out from source and put your html and css files in the examples/ directory. Run bin/exampleserver to launch the demo server and browse to http://localhost:8000/your-app.html .

See the wiki for documentation.

Its also possible to use sharejs without ace. See the textarea example for details.

Writing a client using node.js

The client API is the same whether you're using the web or nodejs.

Here's an example application which opens a document and inserts some text in it. Every time an op is applied to the document, it'll print out the document's version.

Run this from a couple terminal windows when sharejs is running to see it go.

var client = require('share').client;

// Open the 'hello' document, which should have type 'text':'hello', 'text', 'http://localhost:8000/sjs', function(error, doc) {
    // Insert some text at the start of the document (position 0):
    doc.insert("Hi there!\n", 0);

    // Get the contents of the document for some reason:

    doc.on('change', function(op) {
        console.log('Version: ' + doc.version);

    // Close the doc if you want your node app to exit cleanly
    // doc.close();

NOTE: If you're using the current version in npm (0.4) or earler, the argument order is the other way around (function(doc, error)).

See the wiki for API documentation, and examples/node* for some more example apps.

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