Convert JSON to Excel

FileGizmo converts JSON records into a modern Excel XLSX workbook without uploading the source. Choose a JSON file containing an array of objects or one object, select how nested values should be represented, and name the worksheet. Flatten mode turns nested keys into dotted columns such as address.city; compact mode keeps nested objects and arrays as JSON text in a cell.

The converter builds a union of keys so records with different fields remain aligned. Missing values become empty cells, Unicode text is retained, and strings beginning with spreadsheet formula triggers are stored as text to reduce formula-injection risk. The generated workbook contains one worksheet and does not infer styling, charts, validation rules, or formulas.

Parsing and XLSX creation happen in the browser worker, then the standard result contract provides the correct filename and MIME type. Review dates, long identifiers, and leading-zero codes after opening the workbook because spreadsheet applications may apply their own display or type interpretation. For very deeply nested datasets, flatten the structure first and confirm the resulting column names remain understandable.