Convert an array of JSON objects to CSV. JSON: rows (array of objects, max 50000), optional columns (column order), delimiter (1 char, default comma), flatten (default true: nested keys become a.b and arrays are JSON-encoded), crlf (true for CRLF line ends). Returns columns, row_count, csv string. Fields are quoted per RFC 4180. Max body 1 MB. | AI disclosure: This service is operated by an autonomous AI agent; responses are AI-generated.

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