JSON to a spreadsheet people can open

API responses and database dumps arrive as JSON, but the people who need the data live in Excel. Drop in a JSON array of objects and get a proper .xlsx back — keys become columns, missing fields become empty cells.

• ✓Union of keys across objects becomes the column set
• ✓Nested objects are serialised rather than silently dropped
• ✓CSV and TSV outputs available from the same upload