JSON to Excel Converter
Data ConversionBuild a real .xlsx spreadsheet from JSON, with typed cells and a frozen header.
Runs entirely in your browser — nothing is uploaded
Features
- Writes a genuine .xlsx workbook, not a CSV with the wrong extension.
- Numbers stay numbers and ISO dates become real dates.
- Bold, frozen header row with filter dropdowns ready to use.
- Column widths sized to the content.
- Preview the sheet before you download it.
- Built in your browser — nothing is uploaded.
How to use the JSON to Excel Converter
- 1Paste a JSON array of objects, or drop a .json file.
- 2Set the sheet name and the header options.
- 3Check the preview, then download the .xlsx file.
Frequently asked questions
Is this a real Excel file or a renamed CSV?
A real one. An .xlsx is a ZIP of XML parts, and the workbook, worksheet and style definitions are all written properly — which is what lets numbers stay numeric, dates stay dates and the header stay frozen. A renamed CSV can do none of that.
Will my numbers arrive as numbers?
Yes. Numbers are written as numeric cells and ISO dates like 2026-01-08 as real date cells, so they sum and sort in Excel straight away. This is the single most common complaint about JSON-to-Excel converters and it is worth checking on any tool you use.
Which apps can open the file?
Excel, Google Sheets, LibreOffice Calc, Apple Numbers and anything else that reads .xlsx — it is the standard Office Open XML format.
How are nested objects handled?
They are flattened into dotted column names — address.city, tags.0 — because a spreadsheet cell holds one value. Turn flattening off and the nested value is written into the cell as JSON text instead.
Is there a row limit?
Only your device’s memory. The workbook is assembled in the browser, so a few tens of thousands of rows is comfortable; a million-row export is better done server-side.