Convert JSON to CSV instantly.
Open a JSON file, flatten arrays into spreadsheet rows, edit or clean the data, then export as CSV or Excel — all in your browser.
How it works
Three simple steps
Open your JSON file
Drag and drop a JSON file to automatically flatten it into spreadsheet rows.
Review the table
Check the imported columns, edit values, and clean the data if needed.
Export as CSV
Download the result as a CSV file or export as Excel.
Key features
Everything you need
Automatic flattening
JSON arrays of objects are automatically converted to spreadsheet rows and columns.
Multiple export formats
Export the converted data as CSV, XLSX, or keep it as JSON.
Edit after import
Modify, sort, filter, and clean the data before exporting to CSV.
Browser-based processing
No uploads — your JSON data is processed locally and stays on your device.
Your data stays on your device
SheetTool processes everything locally in your browser. Your files are never uploaded to a server. No account required.
FAQ
Frequently asked questions
What JSON structure does SheetTool support?
SheetTool works best with JSON arrays of objects (e.g. [{"name":"A"},{"name":"B"}]). Each object becomes a row, and each key becomes a column.
Can I edit the data after converting JSON to CSV?
Yes. After import, you can edit cells, sort columns, filter rows, and clean the data before exporting.
Is the JSON to CSV conversion free?
Yes. SheetTool is completely free with no sign-up and no file size limits.
Does my JSON file get uploaded anywhere?
No. All processing happens locally in your browser. Your data never leaves your device.
Ready to get started?
Open SheetTool and start working with your files right away. No sign-up needed.