How does it decide the columns?

It collects every key from the objects and uses them as CSV headers, so all rows line up.

Yes. Switch the mode to CSV to JSON and paste tabular data to get an array of objects.

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JSON to CSV Converter

Turn a JSON array into a CSV table, or paste CSV to get JSON back. Great for spreadsheets and APIs. Free, nothing is uploaded.

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Direction

RESULT

How does it decide the columns?: It collects every key from the objects and uses them as CSV headers, so all rows line up.
Can it convert back?: Yes. Switch the mode to CSV to JSON and paste tabular data to get an array of objects.