What JSON structure does it expect?

An array of objects (e.g. [{"name":"Alice","age":30}]). The keys become column headers.

What if my JSON has nested objects?

Nested objects are flattened using dot notation (e.g. 'address.city'). Arrays within objects are stringified.

Yes! Use the 'Paste JSON' tab to input data directly without creating a file.

Yes. Columns are auto-sized based on content length for easy reading.

SheetJS handles large datasets efficiently. Performance depends on your device's memory.

SPREADSHEET

Turn JSON arrays into formatted Excel spreadsheets instantly — auto-generated headers, type detection, all in your browser.

Files never uploadedInstant conversionNo account needed

Loading converter…