CSV ↔ JSON

Turn a CSV table into JSON, or JSON rows back into CSV. Stays on this device. 100% client-side processing in your browser. Absolute privacy with zero file uploads — files never leave this device.

Convert CSV rows to JSON objects, or JSON arrays back to CSV.

CSV to JSON turns a table into JSON, or JSON rows back into CSV, in this tab.

The first row is treated as the header. Check commas and quotes if a column splits in the wrong place.

Questions

Does the first row become keys?

Yes. Header cells become the JSON field names.

Is the spreadsheet uploaded?

No. Conversion stays in the browser. Paste or drop the text locally.