XLSX to JSON Converter
Upload an Excel spreadsheet and convert it to a JSON array — free, instant, browser-based whenever possible.
Drop your XLSX file here
or click to browse
How to convert XLSX to JSON
- Click the drop zone or drag your .xlsx file onto it.
- SheetJS reads the first worksheet and extracts all rows.
- The header row becomes JSON keys; each data row becomes an object.
- Click Download to save the resulting .json file.
Privacy — your data stays local
This tool uses SheetJS, an open-source library that runs entirely in your browser. Your spreadsheet and JSON data are never sent to a server. All processing happens locally on your device.
Frequently Asked Questions
What JSON structure is expected?
An array of objects where each object has the same keys. The keys become column headers in the XLSX.
Which XLSX sheets are read?
Only the first sheet (worksheet) is read when converting XLSX to JSON.
Are formulas preserved?
When reading XLSX, formulas are converted to their computed values. JSON does not support spreadsheet formulas.
Is there a file size limit?
No hard limit — it depends on your browser's available memory. Files up to a few hundred MB typically work fine.
Is this tool free?
Yes — completely free, no account required.