There are tools which check links in HTML, so one option would be to
convert your Markdown files to HTML and then check the links in there.

-- 
Better --help|less than helpless

Den lör 12 sep. 2020 21:12Joseph Reagle <joseph.2011-T1oY19WcHSwdnm+yROfE0A@public.gmane.org> skrev:

> It's time to check which links in my syllabi are broken, and I'm again
> cursing under my breath that there's no multi-format linkchecker out there
> that can report line numbers. Then I thought, what about my favorite tool!?
>
> Pandoc already chases links for `self-contained`, so I suspect this
> wouldn't be hard. Bonus: could it report the line of a markdown file where
> a broken link is?
>
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