JSON to CSV Converter

CSV (comma-separated values) is the lingua franca of spreadsheets and bulk imports, while JSON is what most APIs return. This converter bridges the two for the common case: a JSON array of flat objects. It parses your input with JSON.parse, then takes the column headers from the keys of the first object only. Each subsequent object is emitted as a row, reading values in that same key order. That design has a deliberate trade-off you should know about: if later objects have keys the first object lacks, those extra columns are silently dropped, and if a later object is missing a key, its cell is left blank. Values are coerced with String(); null and undefined become empty cells, and nested objects or arrays are written as inlined JSON (via JSON.stringify) rather than being flattened into separate columns. For quoting, any value containing a comma, double quote, or newline is wrapped in double quotes with internal quotes doubled, following the RFC 4180 quoting convention. One caveat: rows are joined with a plain newline (LF), not the CRLF that RFC 4180 specifies, so most tools accept it but strict parsers may want CRLF.