Is this a real .xlsx?

Yes. It is an Office Open XML workbook built in the browser, not a renamed CSV.

How are nested keys handled?

Same flatten as JSON to CSV: user.name, tags.0.

Do I need Excel installed to preview?

The page shows a CSV preview. Download the file for Excel, Sheets, or LibreOffice.

Cells are exported as text/inline strings. This is a data dump, not a modeler.

Runs in your browser · Last updated 4 September 2026

JSON to Excel Converter Online

Flatten JSON into a real .xlsx workbook in your browser. Nested keys become columns. Nothing is uploaded.

JSON or NDJSON

2 rows · 4 columns

id,user.name,user.city,tags.0
1,Ada,London,math
2,Grace,New York,navy

How to use this tool

Paste an array of objects or NDJSON.
Check the flattened preview.
Download export.xlsx.

CSV vs Excel

If you only need Sheets, the JSON to CSV converter with a UTF-8 BOM is enough. This page exists because people search for Excel and because some Windows setups still mangle CSV encodings.

Frequently asked questions

Is this a real .xlsx?: Yes. It is an Office Open XML workbook built in the browser, not a renamed CSV.
How are nested keys handled?: Same flatten as JSON to CSV: user.name, tags.0.
Do I need Excel installed to preview?: The page shows a CSV preview. Download the file for Excel, Sheets, or LibreOffice.
Is the JSON uploaded?: No.
What about formulas?: Cells are exported as text/inline strings. This is a data dump, not a modeler.