Spreadsheets export CSV; APIs and JavaScript apps want JSON. This converter turns one into the other without a trip to the command line: paste your CSV or drop in a file, and get a clean, pretty-printed JSON array of objects. The delimiter is detected automatically — comma, semicolon or tab — and quoted fields containing commas or line breaks are parsed correctly, so real-world exports survive intact.
Options That Match Real Files
Most CSV files carry a header row, which the converter uses as the JSON keys by default; turn that off and you get arrays of values instead. If detection guesses the wrong delimiter — common with European exports that use semicolons — you can force one manually. A preview count tells you how many records were read before you download. If a row has a different number of fields than the header, the tool reports it rather than quietly producing broken JSON, so you can fix the source.
How to Convert CSV to JSON
- Paste CSV text into the box, or upload a .csv file.
- Check the detected delimiter, or choose one yourself.
- Keep headers on to use the first row as keys, or turn it off.
- Review the record count and the JSON output.
- Copy the JSON or download it as a .json file.
Common Uses
Developers convert sample data into fixtures and seed files. Analysts hand spreadsheet data to web dashboards. Shop owners turn product exports into formats their apps import. Students learning JSON see their own familiar table data in the new shape, which makes the structure click.
Frequently Asked Questions
Are numbers kept as numbers in the JSON?
Values that are plainly numeric are output as numbers, and the rest stay strings. Leading-zero codes like 007 are kept as strings so they are not destroyed.
Is my file uploaded to a server?
No. The file is read and converted entirely inside your browser, which makes it safe for internal or customer data.
What counts as a ragged row?
A row with more or fewer fields than the header row. The tool names the row so you can repair the CSV and convert again.