Free tools / CSV to JSON

CSV to JSON

Paste CSV or spreadsheet cells and get a JSON array with one object per row. The first row becomes the keys and values that look like numbers become numbers.

Is there personal data in what you are about to paste into an AI chat? Scrub it first, also in your browser.

How it works

Questions

How are the keys chosen?

The first row is used for the keys. Empty or repeated column names get a number added so that every key is unique. Untick First row is a header to get arrays instead of objects.

Are numbers converted?

Values that look like numbers are written as JSON numbers, including European notation such as 1.234,56. Everything else stays a string.

Does it also read JSON?

Yes, the converter works in both directions. Paste a JSON array and choose CSV, Markdown or Excel / Sheets as the output.

Is my data uploaded?

No. The conversion runs in JavaScript on this page, on your own computer. There is no account and nothing you paste is sent to a server. Once the page has loaded it keeps working without an internet connection.

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