ChakraCore is the core part of the Chakra Javascript engine that powers Microsoft Edge
JavaScript C++ C Assembly Groff Batchfile Other
Latest commit cb7817b Jan 21, 2017 Sandeep Agarwal [MERGE #2380 @agarwal-sandeep] Fix debugging return value inspection …
…and continue after exception scenarios

Merge pull request #2380 from agarwal-sandeep:vso9847187

During redeferal change a check was removed, this broke return value
inspection and continue after exception scenario for builtins and
external functions. Basically we for debugging we wrap non script functions
in a try catch for continue after exception.

If CSP policy says eval is disabled, we should call the right entrypoints during debugging


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ChakraCore is the core part of Chakra, the high-performance JavaScript engine that powers Microsoft Edge and Windows applications written in HTML/CSS/JS. ChakraCore supports Just-in-time (JIT) compilation of JavaScript for x86/x64/ARM, garbage collection, and a wide range of the latest JavaScript features. ChakraCore also supports the JavaScript Runtime (JSRT) APIs, which allows you to easily embed ChakraCore in your applications.

You can stay up-to-date on progress by following the MSEdge developer blog.

Build Status

Debug Test Release
Windows (x64) x64debug x64test x64release
Windows (x86) x86debug x86test x86release
Windows (ARM) armdebug armtest armrelease
Ubuntu 16.04 (x64) linuxdebug linuxtest linuxrelease
Ubuntu 16.04 (x64 static) linuxsdebug linuxstest linuxsrelease
OS X 10.9 (x64 static) osxsdebug osxstest osxsrelease

If you see badges reading "Build: Unknown" it is likely because a build was skipped due to changes being only in files known not to affect the health of the build.

Above is a table of our rolling build status. We run additional builds on a daily basis. See Build Status for the status of all builds.


If you believe you have found a security issue in ChakraCore, please share it with us privately following the guidance at the Microsoft Security TechCenter. Reporting it via this channel helps minimize risk to projects built with ChakraCore.


Building ChakraCore

You can build ChakraCore on Windows 7 SP1 or above, and Windows Server 2008 R2 or above, with either Visual Studio 2013 or 2015 with C++ support installed. Once you have Visual Studio installed:

  • Clone ChakraCore through git clone
  • Open Build\Chakra.Core.sln in Visual Studio
  • Build Solution

More details in Building ChakraCore.

Alternatively, you can get pre-built ChakraCore binaries from our NuGet Packages.

Using ChakraCore

Once built, you have a few options for how you can use ChakraCore:

  • The most basic is to test the engine is running correctly with the ch.exe binary. This app is a lightweight hosting of JSRT that you can use to run small applications. After building, you can find this binary in:
    • Build\VcBuild\bin\${platform}_${configuration}
    • (e.g. Build\VcBuild\bin\x64_debug)
  • You can embed ChakraCore in your applications - see documentation and samples.
  • Finally, you can also use ChakraCore as the JavaScript engine in Node. You can learn more by reading how to use Chakra as Node's JS engine

A note about using ChakraCore: ChakraCore is the foundational JavaScript engine, but it does not include the external APIs that make up the modern JavaScript development experience. For example, DOM APIs like document.write() are additional APIs that are not available by default and would need to be provided. For debugging, you may instead want to use print().


Contributions to ChakraCore are welcome. Here is how you can contribute to ChakraCore:

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact with any additional questions or comments.

Please refer to Contribution guidelines for more details.


Code licensed under the MIT License.


For details on our planned features and future direction please refer to our roadmap.

Contact us

For questions about ChakraCore, you can reach us on Gitter or open an issue and prefix the issue title with [Question]. See Question tag for already-opened questions.