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knockout /knockout

Knockout makes it easier to create rich, responsive UIs with JavaScript

9.8K Stars 1.6K Forks Last release: 8 months ago (v3.5.1) Other 1.8K Commits 44 Releases

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Knockout is a JavaScript MVVM (a modern variant of MVC) library that makes it easier to create rich, desktop-like user interfaces with JavaScript and HTML. It uses observers to make your UI automatically stay in sync with an underlying data model, along with a powerful and extensible set of declarative bindings to enable productive development.

Getting started

Join the chat at

Totally new to Knockout? The most fun place to start is the online interactive tutorials.

For more details, see

Downloading Knockout

You can download released versions of Knockout from the project's website.

For Node.js developers, Knockout is also available from npm - just run

npm install knockout


Building Knockout from sources

If you prefer to build the library yourself:

  1. Clone the repo from GitHub
git clone cd knockout
  1. Acquire build dependencies.

Make sure you have Node.js installed on your workstation. This is only needed to build Knockout from sources. Knockout itself has no dependency on Node.js once it is built (it works with any server technology or none). Now run:

npm install -g grunt-cli npm install

The first


command sets up the popular Grunt build tool. You might need to run this command with


if you're on Linux or Mac OS X, or in an Administrator command prompt on Windows. The second


command fetches the remaining build dependencies.

  1. Run the build tool

Now you'll find the built files in



Running the tests

If you have phantomjs installed, then the


script will automatically run the specification suite and report its results.

Or, if you want to run the specs in a browser (e.g., for debugging), simply open


in your browser.


MIT license -

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