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

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1Drop your JSON file onto the converter above, or click to browse and select a file.
2Adjust any conversion options such as output format, quality, or delimiter settings.
3Click the Convert button. The file is processed instantly in your browser.
4Download your converted XLSX file. Your original file is unchanged.

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Your files never leave your device. All processing happens in your browser using WebAssembly.

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No upload wait times, no server queues. Conversion starts immediately and completes in seconds.

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Single-file conversion is always free with no account required. Upgrade for batch processing and more.

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.
Can I paste JSON directly instead of uploading a file?: Yes! Use the 'Paste JSON' tab to input data directly without creating a file.
Are column widths auto-sized?: Yes. Columns are auto-sized based on content length for easy reading.
What about large JSON files with thousands of records?: SheetJS handles large datasets efficiently. Performance depends on your device's memory.