Data to Excel

JSON arrays, CSV text, and XML data. The format is auto-detected when you paste or upload your data.

Yes! The .xlsx file is generated entirely in your browser using the SheetJS library. No data is uploaded to any server.

Yes, you can set a custom sheet name in the options. The default is 'Sheet1'. The sheet name is also used for the downloaded filename.

Nested objects are flattened using dot notation (e.g., 'address.city'). Arrays within objects are converted to JSON strings in the cell.

There's no hard limit in the tool. Excel supports up to 1,048,576 rows. Very large datasets may take a moment to process in the browser.

The tool generates .xlsx files, which is the modern Office Open XML format used by Microsoft Excel 2007 and later. These files are compatible with Excel, Google Sheets, LibreOffice Calc, Apple Numbers, and most other spreadsheet applications. The .xlsx format supports rich features like auto-fit column widths and multiple data types.

Yes. Nested JSON objects are automatically flattened using dot notation. For example, an object like {"address": {"city": "NYC"}} becomes a column named 'address.city'. Arrays within objects are converted to JSON string representations in the cell, preserving all data while keeping the spreadsheet readable.

The tool preserves basic data types: numbers remain numeric in Excel (not stored as text), boolean values are preserved, and strings stay as text. Date strings are stored as text by default since automatic date parsing can introduce errors with ambiguous formats. You can reformat date columns in Excel after export if needed.