A Knockout plugin that syncs observable variables between all clients automatically
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Knockout Live Plugin


Clone the repository

npm install
node server.js

Visit /index.html to see the example chat application.


  • js/knockout.live.plugin.js on the client
  • js/main.js has the example for the chat application
  • server.js running on node server


  • Knockout 3.4.0
  • Socket.io v1.3.7 client/server
  • Node.js and socket.io on the server side
  • index.html should be requested from a web server e.g. apache, nginx


  • The chat example runs on port 4000, change port variable in js/main.js and server.js if required
  • Check the terminal for logs (message sent & disconnected client)

What do you need for your application to go "live"?:

  • Set .live() on all ko.observable() and ko.observableArray() you want to synchronize remotely(see the chat example)
  • Run ko.utils.socketConnect(address,port) before ko.applyBindings()

Options for live():

  • id: "my_id" sets a custom ID for sync purposes. This is useful if you are syncing between different apps.
  • readonly: true blocks all direct changes to the live observable. It will update only by socket messages from the server.


  • Adapter interface for sync options besides socket.io