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Checks whether the JavaScriptCore library is loaded.

Component Version macOS Windows Linux Server iOS SDK
JavaScriptWebKit 13.1 ✅ Yes ✅ Yes ✅ Yes ✅ Yes ✅ Yes
MBS( "JavaScript.Available" )




Returns 1, 0 or error.


Checks whether the JavaScriptCore library is loaded.
Always loaded on macOS since we use the one coming with macOS.

For Windows you can load JavaScriptCore.dll and for Linux you can load the file with JavaScript.LoadLibrary function.

Returns always 1 on macOS and iOS.


Check status:

If [ MBS( "JavaScript.Available" ) = 1 ]
    Show Custom Dialog [ "JavaScript library loaded." ]
    # on Windows and Linux, you must load it via script
    Show Custom Dialog [ "JavaScript library not loaded." ]
End If

See also

Release notes

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This function does not need a paid license.

Created 25th January 2023, last changed 7th May 2023

Java.SetStaticField - JavaScript.CF

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