Does the first row need to be headers?

Yes. The first row is treated as the column names, which become JSON keys.

Does the data get uploaded?

No. All processing happens in your browser.

Comma (,) by default. Tab and semicolon delimiters are also supported.

Yes. Export your Excel file as CSV first, then convert to JSON.

fast

Convert CSV files to JSON format online for free.

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Convert CSV files to JSON format online for free.

Coming soon — full implementation in progress

Paste your CSV data or upload a .csv file.

The tool reads the header row and maps columns to JSON keys.

Copy the JSON or download it as a .json file.

Convert JSON data to CSV format online for free. Download as spreadsheet.

Format, validate, and minify JSON data online. Syntax highlighting, error detection, and tree view.

Convert Excel (XLSX, XLS) files to CSV format online for free.