CSV to JSON

Turn a spreadsheet into JSON

Paste rows from a spreadsheet and get clean JSON. It works the other way too.

Paste your spreadsheet rows

CSV

CSV → JSONJSON → CSV

Turn numbers and true/false into values

This all happens on your device. Nothing you type or add is sent anywhere. Check it yourself

Is my data uploaded?

No. It's converted in this tab, and the page's security policy blocks it from sending data anywhere.

Can I use an Excel file?

Save it as CSV first (File, Save as, CSV). Reading .xlsx directly is on the list.

Runs	In your browser. Your files stay on your device.
Engine	Papa Parse 5.7 (MIT), in your browser
Delimiters	Comma, semicolon, tab and pipe, detected automatically
Works offline	Yes, once the page has loaded
Licence	AGPL-3.0
Added	27 September 2026
Built by	Sapience Design
Source	tools/data/csv-to-json