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

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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

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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 and Java installed on your workstation. These are only needed to build Knockout from sources. Knockout itself has no dependency on Node.js or Java once it is built (it works with any server technology or none). Now run:

   npm install
  1. Run the build tool
   npm run grunt

Now you'll find the built files in


To run a single task, use

   npm run grunt -- build:debug

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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