Convert Excel (XLSX) to JSON Online Free

Need spreadsheet data in your code? AllConvert converts XLSX to JSON instantly, right in your browser — each row becomes an object, ready for any API or app. No upload, no account.

Why convert XLSX to JSON?

JSON is what code speaks: web apps, REST APIs, NoSQL databases and config files all consume JSON. When the source data lives in an Excel sheet — a product list, translations, test fixtures, a pricing table — converting it to JSON turns each spreadsheet row into an object your program can use directly, with no Excel parsing library required in your project.

What shape does the output have?

The first row of the sheet is treated as the header: its cells become the keys. Every following row becomes one JSON object, and the whole sheet becomes an array of objects — the shape virtually all code expects. Only the first sheet of the workbook is converted, so reorder sheets first if needed.

Round trips and related formats

Need to load JSON back into Excel later? AllConvert converts JSON to XLSX too. For a lighter intermediate format, XLSX to CSV followed by CSV to JSON gives you the same result with an inspectable middle step.

How to convert

1. Open AllConvert and drop your XLSX file onto the page.
2. Select JSON from the format dropdown on the file card.
3. Click Convert and download your result.

The entire process runs locally in your browser. Nothing is uploaded, and it works on desktop and mobile, in Chrome, Firefox, Safari, and Edge.