JSON to XLSX Converter

1. Paste a JSON array of objects or choose a local `.json` file.
2. Select Convert to XLSX to validate and prepare the workbook.
3. Review the worksheet preview and row and column counts.
4. Select Download XLSX to save `converted.xlsx`.

[
  { "id": "001", "name": "Roby", "score": 95, "active": true },
  { "id": "002", "name": "Budi", "score": null, "city": "Jakarta" }
]

The workbook uses one worksheet named Data. The IDs stay as text, 95 becomes a numeric cell, true becomes a boolean cell, and missing or null fields become blank cells.

Each top-level object becomes one row. Keys are collected across every object without sorting. Nested objects and arrays are written as compact JSON text, while date-looking strings remain text.

Input is limited to 1,000,000 characters, 10,000 rows, 200 columns, 200,000 cells, and 100 levels of nesting. Local file imports must be 4 MB or smaller. The preview shows the first eight rows; the workbook contains every accepted row.

Duplicate keys follow standard JSON behavior, so the final value wins. Strings that start with spreadsheet formula characters remain literal text and are never exported as formulas.

Your JSON is processed in your browser and is not uploaded. Input, filenames, previews, and generated workbook bytes stay in memory for the current page session and are not stored by this tool.