JSON → CSV

Three shapes are accepted: an array of objects (the most common), an array of arrays, or a single object. Array of objects becomes one CSV row per object with the union of all keys as columns. Nested objects or arrays inside a value are stringified as JSON into a single cell.

Keys are collected in the order they first appear across all objects, so the header order follows your data. If the "Include header row" option is off, only the data rows are written — useful when you want to append to an existing file.

Cells containing the delimiter, a double quote, or a newline are wrapped in double quotes and embedded quotes are doubled, following the standard CSV rules. This guarantees the file reopens correctly in Excel, Google Sheets, and other tools. You can also enable "Quote all cells" to force-quote everything.

The tool parses your input first and shows a clear error with the JSON parser message when it fails. Empty arrays and mixed shapes (some objects, some arrays) also produce specific, helpful messages instead of silently breaking.

Yes. JSON parsing and CSV generation happen entirely in your browser with no upload, so it is safe for confidential data and works fully offline. The result can be copied or downloaded as a .csv file.

Yes — comma, semicolon, tab, and pipe are supported. Semicolons and tabs are useful for regional spreadsheet locales that do not treat commas as separators.