JSON to CSV Converter

An array of objects, where each object becomes one CSV row and each key becomes a column. The column set is the union of all keys across every object, so records with missing fields simply leave those cells empty rather than breaking the table. Upload a .json or .txt file or paste the data directly.

When enabled, nested objects are collapsed into single columns using dot notation, so {"user": {"name": "John"}} produces a user.name column, and arrays become one cell with their items joined by commas. It is off by default, in which case a nested object is written as its serialized text representation.

Include column headers writes the key names as the first row. Quote string values wraps string cells in double quotes, while values containing delimiters, quotes, or line breaks are always quoted and internal quotes are doubled regardless of the setting. Convert null to empty string, on by default, leaves null cells blank; turning it off writes the literal text null instead.

Check it when the download will be opened directly in Microsoft Excel. It prefixes the file with a UTF-8 byte order mark so Excel decodes the encoding correctly; without it, accented characters and other non-ASCII text can render as mojibake. The comma, semicolon, tab, and pipe delimiter choices also help match your locale's Excel expectations.

No. The file is read locally with the browser FileReader API, conversion and the preview table run in the page, and the CSV download is generated on your device. Your data is not transmitted anywhere.