Chakra (JavaScript engine)

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This article is about the JavaScript engine used in Microsoft Edge. For the JavaScript engine used in Internet Explorer 9 through 11, see Chakra (JScript engine). For other uses, see Chakra (disambiguation).
Developer(s) Microsoft
Development status Active
Operating system Microsoft Windows
Type JavaScript engine
License MIT License

Chakra is a JavaScript engine developed by Microsoft for its Microsoft Edge web browser. It is a fork of the JScript engine used in Internet Explorer. Like the Edge layout engine and unlike previous versions in Internet Explorer the declared intention is that it will reflect the "Living Web".[1] On December 5th of 2015, it was announced that core components of Chakra will be open-sourced as ChakraCore.

Standards support[edit]

Chakra supports ECMAScript 5.1 with partial support for ECMAScript 6.[2]

Open Sourcing[edit]

On December 5th 2015, Microsoft announced plans to open source the Chakra engine as ChakraCore, which will include all the key components of the JavaScript engine powering Microsoft Edge on their Github page under the MIT license in January 2016.[3] ChakraCore is essentially the same as the Chakra engine that powers the Microsoft Edge browser, but with platform-agnostic bindings, i.e. without the specific interfaces utilised within the Windows Universal App platform. On January 13, 2016 Microsoft released as promised ChakraCore under the MIT license on GitHub.[4][5]

Microsoft has also created a project on GitHub that allows Node.js to use ChakraCore as its JavaScript engine instead of V8.[6]

See also[edit]


  1. ^ "Targeting Edge vs. Legacy Engines in JsRT APIs". Retrieved 10 September 2015. 
  2. ^ "Microsoft Edge Platform Status". Retrieved 10 September 2015. 
  3. ^ "Microsoft Edge's JavaScript engine to go open-source". Microsoft. Retrieved December 8, 2015. 
  4. ^ Microsoft open sources Edge web browser's JavaScript engine, plans port to Linux on by Steven J. Vaughan-Nichols (on January 13, 2016)
  5. ^ ChakraCore on
  6. ^ Node.js enabled for ChakraCore on

External links[edit]