Here is how I test microformats markup on my website.

First I install mf2py:

sudo dnf install python3-mf2py

Then I define this one-liner Bash function:

mf2test() { python -c 'import sys; import mf2py; import json; print(json.dumps(mf2py.parse(url=sys.argv[1])))' $1 | jq; }

And then I can test a website like this:

$ mf2test https://blog.rickardlindberg.me/2026/02/05/075110.html
{
  "items": [
    {
      "type": [
        "h-entry"
...