This converter flattens a JSON array of objects into CSV: the union of all keys becomes the header row, and each object becomes one line. Values containing commas, quotes or line breaks are wrapped in double quotes with internal quotes doubled, which is what RFC 4180 requires and what Excel and Google Sheets expect — skip that step and a single comma inside an address field silently shifts every column after it. Objects with different key sets are reconciled so the grid stays rectangular, with missing values left blank. It is the practical way to hand API data to a colleague who works in spreadsheets rather than code.
Free, fast, and runs entirely in your browser — no signup, no upload to a server.