https://tableconvert.com/ Show archive.org snapshot is an online tool to convert tables between different formats (e.g. json, markdown, csv).
It also has a button to transpose a table ("rotate" it by 90 degree).

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Read more Show archive.org snapshot

The tool can be handy if you have tests with large markdown tables for testing contents of a flat json structure or csv.

Please note that you should not use it with sensitive data (like all online tools in general).