Not sure it is supported, however,
You can paste in a script into edit window,
and you could paste the content of an aribitray file into a 0 : 0 multiline 
noun defintion.
    On Tuesday, July 11, 2023 at 01:50:10 p.m. EDT, 'robert therriault' via 
Programming <programm...@jsoftware.com> wrote:  
 
 Hi charles,

The 'J Playground' or'J in a browser' is supported by WASM so it runs the J 
engine on your browser. It was meant to provide a lightweight option for people 
to try J out and not meant to do the same work as the J engine running under 
the console, JQt or JHS environments. That does not mean that what you are 
asking for is not possible - others with more proficiency may suggest ways to 
accomplish the task. I would suggest though that the easiest way to accomplish 
the task you want is to download J and use one of the console, JQt or JHS 
environments that are set up to do exactly what you want.

Hope this helps and welcome to the J community.

Cheers, bob

> On Jul 11, 2023, at 10:35, charles holder <charleswhol...@gmail.com> wrote:
> 
> How do I *read from/write to* a file on my computer in *J in a browse*r?
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm

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For information about J forums see http://www.jsoftware.com/forums.htm
  
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For information about J forums see http://www.jsoftware.com/forums.htm

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