ConvertWarp

CSV to JSON

The first row becomes the names. Each following row becomes one JSON object.

About this tool

Spreadsheets export CSV; many APIs and static sites want an array of JSON objects. This page treats the first row as column names and every following row as one object. The table is parsed in the browser.

Semicolon-separated European exports are refused with a clear error — this parser wants commas. A file that is already JSON is sent to JSON to CSV instead of being mangled. Quotes and commas inside fields follow ordinary CSV rules.

The file is read as UTF-8 locally (a BOM is stripped). 50 MB. Empty trailing rows are skipped. Duplicate headers are made unique so keys do not collide silently.

How to convert CSV to JSON

  1. Choose a CSV. It stays on your device.
  2. Convert. The first row becomes keys.
  3. Download the JSON.

50 MB. Comma-separated only. Not Excel .xlsx — use Excel to PDF or export CSV from Excel first.

FAQ

Are spreadsheet rows posted when they become JSON objects?
No. Parsing is in this tab. We never see the rows.
First row is data, not names?
This tool always treats row one as headers. Add a header row in the spreadsheet first.
Nested JSON?
No. You get a flat list of objects. Cell text stays strings.
Are CSV cells coerced to JSON numbers?
Values stay strings so leading zeros on IDs are not eaten. Parse them in your app if you need types.
Can I go back?
JSON to CSV expects a list of objects or one object.

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