What JSON input format is supported?

Array of objects is the standard format. Single objects are also supported and produce a two-row CSV.

How are nested objects handled?

Nested properties are flattened with dot notation (e.g. 'user.address.city').

Yes — comma, semicolon, tab, or pipe.

Yes. Use the paste tab for quick one-off conversions without creating a file.

Nested arrays are stringified (JSON-encoded) as a single CSV cell value.

SPREADSHEET

Flatten JSON arrays to CSV in seconds — smart key extraction, configurable delimiter, paste or upload. All in your browser.

Files never uploadedInstant conversionNo account needed

Loading converter…

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 CSV file. Your original file is unchanged.

🔒

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

⚡

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

🆓

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

What JSON input format is supported?: Array of objects is the standard format. Single objects are also supported and produce a two-row CSV.
How are nested objects handled?: Nested properties are flattened with dot notation (e.g. 'user.address.city').
Can I choose the delimiter?: Yes — comma, semicolon, tab, or pipe.
Can I paste JSON instead of uploading?: Yes. Use the paste tab for quick one-off conversions without creating a file.
What about arrays within JSON objects?: Nested arrays are stringified (JSON-encoded) as a single CSV cell value.