XLSX to JSON

Convert an Excel workbook to JSON — the first sheet as an array, or all sheets keyed by name.

Runs in your browser

XLSX, XLSMJSON100% local · no upload

Guide

How to convert xlsx to json

Pick your spreadsheet
Select an .xlsx or .xlsm workbook (up to 50 MB).
Convert to JSON
Rows become objects keyed by the header row — one sheet exports as an array, several sheets as objects keyed by sheet name.
Download the JSON
Save pretty-printed JSON for apps, scripts and APIs.

Format details

Input formats: XLSX, XLSM
Output format: JSON
Privacy: No upload · processed locally

Frequently asked questions

How are multiple sheets handled?

Unlike CSV, JSON can hold everything — a single-sheet workbook exports as a plain array, and multi-sheet workbooks export every sheet as an object keyed by its name.

What do the keys come from?

The first row of each sheet is treated as the header; every row below becomes an object using those keys.

How are dates exported?

Cells recognized as dates are serialized as ISO date-time strings, the most portable JSON representation.

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