Parsing Visio VSDX file with javascript

[Nikolay]

Any hints?  With JavaScript. Without Visio installed of course (in browser).

For example, I know for excel there is a nice lib sheet.js that can even parse binary files.
Something like that in javascript that can at least parse OfficeXml zip files?

@Paul - maybe web assembly - which technology would you recommend?
From what I read, they don't have a generic solution to target dotnet code for the browser, just this stupid blazor?
Or am I missing something?