What does the JSON output look like?

Each row becomes a JSON object, keyed by the header row. The result is an array of objects. Empty cells become null.

Can I choose between array-of-arrays and array-of-objects?

Yes. Choose your preferred output format in the options panel.

Both options are available. Pretty-printed is easier to read; minified is smaller for API use.

Multi-sheet workbooks produce one JSON file per sheet, delivered in a ZIP archive.

Excel dates are converted to ISO 8601 strings (e.g. '2024-01-15') in the JSON output.

SPREADSHEET

Transform Excel spreadsheet data into JSON arrays or objects — ideal for developers, APIs, and data pipelines. Runs in your browser.

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