`:top

`!Chakra`! was a `F33f`_`[free and open-source`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Free_and_open-source]`_`f `F33f`_`[JavaScript engine`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=JavaScript_engine]`_`f developed by `F33f`_`[Microsoft`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Microsoft]`_`f for its `F33f`_`[Microsoft Edge Legacy`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Microsoft_Edge_Legacy]`_`f `F33f`_`[web browser`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Web_browser]`_`f. It is a `F33f`_`[fork`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Fork_(software_development)]`_`f of the `F33f`_`[same-named JScript engine`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Chakra_(JScript_engine)]`_`f used in `F33f`_`[Internet Explorer`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Internet_Explorer]`_`f. Like the `F33f`_`[EdgeHTML`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=EdgeHTML]`_`f `F33f`_`[browser engine`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Browser_engine]`_`f, the declared intention was that it would reflect the "Living Web".`:cite-ref-2[`F5bf`_`[2`#cite-note-2]`_`f] The core components of `*Chakra`* were open-sourced as `!ChakraCore`!. In 2021, Microsoft terminated support for the engine, citing its transition to a `F33f`_`[Chromium`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Chromium_(web_browser)]`_`f based engine for `F33f`_`[Edge`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Microsoft_Edge]`_`f. Support has been transferred to the community, where it remains inactive.`:cite-ref-3[`F5bf`_`[3`#cite-note-3]`_`f]

>>Contents

• `F0af`_`[Standards support`#standards-support]`_`f

• `F0af`_`[Open sourcing`#open-sourcing]`_`f

• `F0af`_`[References`#references]`_`f

• `F0af`_`[External links`#external-links]`_`f

-─

>>Standards support

Chakra supports `F33f`_`[ECMAScript`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=ECMAScript]`_`f 5.1 with partial support for `F33f`_`[ECMAScript`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=ECMAScript]`_`f 2015.`:cite-ref-4[`F5bf`_`[4`#cite-note-4]`_`f]

>>Open sourcing

Following an initial announcement on December 5, 2015,`:cite-ref-5[`F5bf`_`[5`#cite-note-5]`_`f]`:cite-ref-chakracoreopensourced-6-0[`F5bf`_`[6`#cite-note-chakracoreopensourced-6]`_`f] Microsoft open sourced the Chakra engine as ChakraCore, including all the key components of the JavaScript engine powering Microsoft Edge [Legacy] on their GitHub page under the `F33f`_`[MIT License`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=MIT_License]`_`f on January 13, 2016.`:cite-ref-chakracoreopensourced-6-1[`F5bf`_`[6`#cite-note-chakracoreopensourced-6]`_`f]`:cite-ref-7[`F5bf`_`[7`#cite-note-7]`_`f] ChakraCore is essentially the same as the Chakra engine that powers the `F33f`_`[Microsoft Edge Legacy`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Microsoft_Edge_Legacy]`_`f browser, but with platform-agnostic bindings, i.e., without the specific interfaces utilized within the `F33f`_`[Universal Windows App`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Universal_Windows_Platform_apps]`_`f platform.

Microsoft has also created a project on `F33f`_`[GitHub`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=GitHub]`_`f that allows `F33f`_`[Node.js`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Node.js]`_`f to use ChakraCore as its JavaScript engine instead of `F33f`_`[V8`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=V8_(JavaScript_engine)]`_`f.`:cite-ref-8[`F5bf`_`[8`#cite-note-8]`_`f]

>>References

`:cite-note-1`!1.`! "Releases · microsoft/ChakraCore · GitHub". `*GitHub ChakraCore repository`*. Retrieved 2021-02-28.

`:cite-note-2`!2.`! `F0af`_`[↑`#cite-ref-2]`_`f "Targeting Edge vs. Legacy Engines in JsRT APIs". Retrieved 10 September 2015.

`:cite-note-3`!3.`! `F0af`_`[↑`#cite-ref-3]`_`f "org/Release 1.12 plan.md at master · chakra-core/org". `*GitHub`*. Retrieved 2023-11-17.

`:cite-note-4`!4.`! `F0af`_`[↑`#cite-ref-4]`_`f "Microsoft Edge Platform Status". Microsoft.com. Retrieved 10 September 2015.

`:cite-note-5`!5.`! `F0af`_`[↑`#cite-ref-5]`_`f "Microsoft Edge's JavaScript engine to go open-source". `F33f`_`[Microsoft`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Microsoft]`_`f. 2015-12-05. Retrieved December 8, 2015.

`:cite-note-chakracoreopensourced-6`!6.`! `F0af`_`[↑`#cite-ref-chakracoreopensourced-6-0]`_`f Microsoft open sources Edge web browser's JavaScript engine, plans port to Linux on `F33f`_`[zdnet.com`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Zdnet.com]`_`f by Steven J. Vaughan-Nichols (on January 13, 2016)

`:cite-note-7`!7.`! `F0af`_`[↑`#cite-ref-7]`_`f ChakraCore on `F33f`_`[github.com`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Github.com]`_`f

`:cite-note-8`!8.`! `F0af`_`[↑`#cite-ref-8]`_`f Node.js enabled for ChakraCore on github.com

>>External links

• ChakraCore on `F33f`_`[GitHub`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=GitHub]`_`f

`c`F0af`_`[↑ Back to top`#top]`_`f`a