#037 · Spreadsheet Conversion Tool

JSON to Excel Converter

Convert a JSON array or a common object collection into an XLSX worksheet locally, with a preview of the columns before download.

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How to use this office tool

  1. Choose a UTF-8 JSON file containing an array of objects or a top-level object with an array property.
  2. Choose how first-level nested objects should be handled.
  3. Convert, check the preview, and download the XLSX workbook.

What this tool does

Convert a JSON array or a common object collection into an XLSX worksheet locally, with a preview of the columns before download.

The converter finds an array of records, normalizes object keys into columns, and writes a new XLSX workbook; nested values can be serialized or flattened one level.

Deeply nested or irregular JSON may need preparation. Arrays inside records are stored as JSON text rather than expanded into repeated rows.

Supported formats

Supported inputs and outputs for JSON to Excel Converter.

FormatSupport
JSONUTF-8 array of objects or top-level object containing an array.
Nested dataSerialized as JSON text or flattened one level.
OutputXLSX workbook with a single Data worksheet.

Tips for better results

  • Use consistent keys across records for a tidy table.
  • Keep nested values as JSON text when flattening would create ambiguous columns.
  • Check large numeric identifiers after opening the workbook.

FAQ

What JSON structure works best for Excel conversion?

A top-level array of similarly shaped objects produces the cleanest spreadsheet.

Can it convert a JSON object that contains an array?

Yes. The converter uses the first array property it finds at the top level.

How are nested objects written to Excel?

You can keep them as JSON text or flatten first-level object properties into dotted column names.

Will very large integers stay exact?

JavaScript can lose precision when JSON numbers exceed its safe integer range. Store critical IDs as quoted strings in the JSON source.

Is the JSON uploaded anywhere?

No. The file is read and converted locally in your browser.

Processing checklist

PrivacyLocal browser processing
PreviewLimited to 5–100 rows
OutputNew file; source remains unchanged

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