What becomes the JSON keys?

The first row of each sheet is treated as the header and used for the object keys, so name your columns before converting.

How are multiple sheets handled?

Each sheet produces its own JSON file, named after the sheet.

Is the data uploaded?

No. Everything runs locally, which matters given how often this conversion involves customer or pricing data.

Free converter

XLSXJSON

XLSX to JSON Converter

Turn a spreadsheet into structured JSON — an array of objects keyed by your header row — without pasting company data into a web tool. It runs locally, handles every sheet in the workbook, and costs nothing.

Download for Windows

Windows 10/11 (x64) · Free · No account

Drop in your files — A .json file per sheet, in the folder you choose.

Why convert

Why convert XLSX to JSON?

JSON is what APIs, config files and nearly every modern tool consume. A spreadsheet is a convenient place for a human to maintain a list, and JSON is the shape that list needs to be in before anything can use it.

Seed or reference data is maintained in a spreadsheet and needs to reach an application.
You want to hand structured data to a script without writing a parser.
A content or config file is edited in Excel by whoever owns it.
You are moving a list into a system that speaks JSON only.

How it works

Convert XLSX to JSON in a few clicks

1
Open Office Converter
Choose it from the tray — no engine download for data conversions.
2
Add the workbook
One XLSX or a whole folder of them.
3
Select JSON
The first row of each sheet is used as the object keys.
4
Convert
Set the output folder and run.

The details

XLSX to JSON, at a glance

Input: XLSX, and XLS for older workbooks
Output: An array of objects per sheet, keyed by the header row
Types: Numbers, booleans and dates emitted as JSON values rather than strings where unambiguous
Encoding: UTF-8
Engine download: None
Limits: No row cap, no file-size cap, no watermark

Questions