How are empty cells represented?

As null, so every object keeps the same keys and column order stays predictable.

The first sheet in the workbook. Reorder sheets in Excel if you need a different one.

Will my data be uploaded?

No. Parsing and conversion happen entirely in your browser — the file never leaves your device.

Convert Excel (XLSX) to JSON

Convert an Excel .xlsx workbook into a pretty-printed JSON array — read locally with SheetJS, nothing uploaded.

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Why convert XLSX to JSON?

JSON is the format APIs and code expect. Converting a spreadsheet to JSON lets developers seed a database or feed an endpoint straight from a business workbook.

How the conversion works

The header row becomes the object keys and each following row becomes one object. Empty cells are kept as null so column positions stay aligned.

Quality & compatibility notes

Only the first worksheet is converted. Dates and numbers are preserved as their cell values, and formulas export as computed results.

How to xlsx to json

Drop a .xlsx (or legacy .xls) file into the zone above.
The first row is used as the JSON keys automatically.
Press Convert to read the workbook locally.
Preview the JSON, then download it.

Related converters

XLSX to CSVExtract the first sheet of a workbook as CSV.CSV to JSONTurn spreadsheet rows into a clean JSON array.JSON to CSVTurn JSON data into a spreadsheet-ready CSV.CSV to XLSXTurn a plain CSV into a native Excel workbook.