Turn a JSON array of objects into CSV, with a header row taken from the object keys.
The input must be an array of objects. Keys become the header, in the order they first appear. Cells that contain a comma, a quote, or a line break are quoted.
Each object is one row. A key that appears only on a later object is still given a column, and earlier rows leave that cell empty. Nested objects and arrays are written as JSON text inside the cell.
Quoting follows the usual CSV rule: a cell with a comma, quote, or line break is wrapped in double quotes, and a quote inside the cell is doubled.
Paste an array of objects, not a single object.
Check the header row against the keys you expected.
Open the CSV in a spreadsheet and confirm that quoted commas stayed in one cell.
[{"name":"Ada","city":"London"}] becomes a header of name,city and one data row.
Pasting a JSON object of arrays and expecting those arrays to become columns.
Wrap it in an array first. A bare object is rejected.
A null or missing value becomes an empty cell.