# Chakra (JavaScript engine)

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Open-source JavaScript engine developed by Microsoft

This article is about the JavaScript engine used in Microsoft Edge Legacy. For the engine of Internet Explorer, see [Chakra (JScript engine)](/source/Chakra_(JScript_engine)). For other uses, see [Chakra (disambiguation)](/source/Chakra_(disambiguation)).

Chakra Developer Microsoft Stable release 1.11.24 / December 8, 2020; 5 years ago (2020-12-08)[1] Written in C++ Operating system Windows, macOS, Linux Platform IA-32, x86-64, ARM, ARM64 Type JavaScript engine License MIT License Website github.com/chakra-core/ChakraCore

**Chakra** was a [free and open-source](/source/Free_and_open-source) [JavaScript engine](/source/JavaScript_engine) developed by [Microsoft](/source/Microsoft) for its [Microsoft Edge Legacy](/source/Microsoft_Edge_Legacy) [web browser](/source/Web_browser). It is a [fork](/source/Fork_(software_development)) of the [same-named JScript engine](/source/Chakra_(JScript_engine)) used in [Internet Explorer](/source/Internet_Explorer). As with the [EdgeHTML](/source/EdgeHTML) [browser engine](/source/Browser_engine), the declared intention was that it would reflect the "Living Web".[2] The core components of *Chakra* were open-sourced as **ChakraCore**. In 2021, Microsoft terminated support for the engine, citing its transition to a [Chromium](/source/Chromium_(web_browser))-based engine for [Edge](/source/Microsoft_Edge). Support has been transferred to the community, where it remains inactive.[3]

## Standards support

Chakra supports [ECMAScript](/source/ECMAScript) 5.1 with partial support for [ECMAScript](/source/ECMAScript) 2015.[4]

## Open sourcing

Following an initial announcement on December 5, 2015,[5][6] 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 [MIT License](/source/MIT_License) on January 13, 2016.[6][7] ChakraCore is essentially the same as the Chakra engine that powers the [Microsoft Edge Legacy](/source/Microsoft_Edge_Legacy) browser, but with platform-agnostic bindings, i.e., without the specific interfaces utilized within the [Universal Windows App](/source/Universal_Windows_Platform_apps) platform.

Microsoft has also created a project on [GitHub](/source/GitHub) that allows [Node.js](/source/Node.js) to use ChakraCore as its JavaScript engine instead of [V8](/source/V8_(JavaScript_engine)).[8]

## References

1. **[^](#cite_ref-1)** ["Releases · microsoft/ChakraCore · GitHub"](https://github.com/microsoft/ChakraCore/releases). *GitHub ChakraCore repository*. Retrieved 2021-02-28.

1. **[^](#cite_ref-2)** ["Targeting Edge vs. Legacy Engines in JsRT APIs"](https://msdn.microsoft.com/en-us/library/dn903710(v=vs.94).aspx). Retrieved 10 September 2015.

1. **[^](#cite_ref-3)** ["org/Release 1.12 plan.md at master · chakra-core/org"](https://github.com/chakra-core/org/blob/master/Release%201.12%20plan.md). *GitHub*. Retrieved 2023-11-17.

1. **[^](#cite_ref-4)** ["Microsoft Edge Platform Status"](https://dev.modern.ie/platform/status//?filter=f0100001c&search=es6). Microsoft.com. Retrieved 10 September 2015.[*[permanent dead link](https://en.wikipedia.org/wiki/Wikipedia:Link_rot)*]

1. **[^](#cite_ref-5)** ["Microsoft Edge's JavaScript engine to go open-source"](https://blogs.windows.com/msedgedev/2015/12/05/open-source-chakra-core/). [Microsoft](/source/Microsoft). 2015-12-05. Retrieved December 8, 2015.

1. ^ [***a***](#cite_ref-ChakraCoreopensourced_6-0) [***b***](#cite_ref-ChakraCoreopensourced_6-1) [Microsoft open sources Edge web browser's JavaScript engine, plans port to Linux](https://www.zdnet.com/article/microsoft-open-sources-its-edge-web-browser-javascript-engine-and-plans-to-port-it-to-linux/) on [zdnet.com](/source/Zdnet.com) by Steven J. Vaughan-Nichols (on January 13, 2016)

1. **[^](#cite_ref-7)** [ChakraCore](https://github.com/Microsoft/ChakraCore) on [github.com](/source/Github.com)

1. **[^](#cite_ref-8)** [Node.js enabled for ChakraCore](https://github.com/Microsoft/node) on github.com

## External links

- [ChakraCore](https://github.com/microsoft/ChakraCore) on [GitHub](/source/GitHub)

v t e ECMAScript Dialects ActionScript Haxe Bosque Caja JavaScript engines asm.js JS++ JScript JScript .NET QtScript Solidity TypeScript WMLScript Engines Carakan Futhark JavaScriptCore JScript KJS Linear B QtScript Rhino SpiderMonkey TraceMonkey JägerMonkey Tamarin V8 ChakraCore Chakra JScript .NET Nashorn Frameworks Client-side Dojo Echo Ext JS Google Web Toolkit jQuery Lively Kernel midori MochiKit MooTools Prototype qooxdoo SproutCore Spry Wakanda Framework Server-side Node.js Deno Bun GraalJS Jaxer AppJet WakandaDB Multiple Cappuccino Libraries Backbone.js SWFObject Underscore.js People Brendan Eich Douglas Crockford John Resig Scott Isaacs Other DHTML Ecma International JSDoc JSGI JSHint JSLint JSON JSSS Sputnik SunSpider Asynchronous module definition CommonJS Lists: JavaScript libraries • Ajax frameworks • Server-side JavaScript Comparison: JavaScript web frameworks

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Adapted from the Wikipedia article [Chakra (JavaScript engine)](https://en.wikipedia.org/wiki/Chakra_(JavaScript_engine)) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Chakra_(JavaScript_engine)?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.