CSV ↔ JSON Converter

It converts between the two formats in either direction: paste CSV and get JSON, or paste a JSON array and get CSV. Flip the direction with one toggle. It is the quick bridge between a spreadsheet export and the JSON a script or API wants — and back again when you need to open data in Excel, Google Sheets or Numbers. The conversion happens as you type.

That is what the “First row is a header” option controls. With it on — the usual case — the first CSV line is treated as column names, so each following row becomes a JSON object keyed by those names. Turn it off and you get an array of arrays instead, one inner array per row, which suits headerless data. Going the other way, the option decides whether a header row of column names is written at the top of the CSV.

CSV has no idea of types — everything in a file is just text. With “Typed values” on, fields that look like numbers or booleans are converted to real JSON numbers and true/false rather than left as strings, so 42 becomes the number 42 and "true" becomes the boolean true. Turn it off if you want every value kept as a string — useful for things like postcodes, phone numbers or IDs with leading zeros that you do not want altered.

A top-level array. The natural fit is an array of objects — each object is a row and its keys become the columns; if different objects have different keys, every key seen becomes a column. An array of arrays also works, writing each inner array as a row. A single object or a bare value cannot become a table, so you will see a clear message asking for an array rather than a wrong result.

Yes. Parsing follows the usual CSV conventions: fields wrapped in double quotes can contain commas and line breaks, and doubled quotes inside a field are read as a literal quote. If your data is tab- or semicolon-separated rather than comma-separated, pick that delimiter and it is used for reading and writing alike. The same rules are applied in reverse when writing CSV, so any value containing the delimiter is quoted automatically.

No. Both directions are parsed and converted entirely in your browser — nothing you paste is sent to a server, which you can confirm in your browser’s network panel. That matters because spreadsheet exports so often hold customer names, emails, orders and other data you would not want to send to a third party. The optional share link keeps the input in the URL itself rather than on a server, and the on-device history can be cleared whenever you like.