JSON to XLSX Converter

Convert JSON files to Excel XLSX format. Supports both array of objects and array of arrays JSON structures with automatic formatting.

Overview

This JSON to XLSX converter transforms your JSON data into a properly formatted Excel spreadsheet entirely in your browser — your files never leave your device. Paste JSON directly or load a file up to 50 MB, and the tool automatically maps arrays of objects into labeled columns or arrays of arrays into rows, flattening nested objects using dot notation. You can preview the resulting table structure before downloading, so you know exactly how your data will look in Excel before you commit to the export.

Key Features

  • Convert JSON to XLSX format
  • Support for array of objects
  • Support for array of arrays
  • Automatic Excel formatting
  • Preview before conversion

Common Use Cases

  • API Response to Spreadsheet — Developers export JSON API responses directly to XLSX for sharing data with stakeholders who work in Excel rather than code.
  • Database Export Conversion — Engineers convert JSON database dumps into Excel files for offline analysis, audit reporting, or handoff to non-technical teams.
  • Nested JSON Flattening — Data analysts flatten deeply nested JSON structures into a clean, column-per-field spreadsheet without writing a custom script.
  • Quick Data Review — Anyone needing to spot-check a JSON dataset uses the table preview to verify structure and column alignment before downloading the XLSX.
  • Sensitive Data Handling — Users working with confidential records convert JSON to Excel without uploading files to a cloud service, keeping data on-device throughout.

How It Works
1

Upload JSON File

Select your JSON file or paste JSON data directly. The tool supports both array of objects and array of arrays formats.

2

Preview Data Structure

Review how your JSON data will be structured in Excel format. The tool automatically detects your JSON structure and creates appropriate columns.

3

Download Excel File

Get your professionally formatted XLSX file with proper column headers and data organization ready for Excel or other spreadsheet applications.

Frequently Asked Questions

What JSON formats are supported?
The tool supports array of objects (where each object becomes a row with properties as columns) and array of arrays (where each sub-array becomes a row). Nested objects are flattened automatically.

How are nested JSON objects handled?
Nested objects are automatically flattened using dot notation. For example, {user: {name: 'John'}} becomes a column named 'user.name' with value 'John'.

Can I convert large JSON files?
Yes, the tool can handle JSON files up to 50MB. For very large datasets, the conversion is optimized to maintain performance while preserving data integrity.

What happens to different data types?
Numbers remain as numbers, strings as text, booleans as TRUE/FALSE, dates are formatted appropriately, and null values become empty cells in Excel.

Are column headers automatically created?
Yes, for array of objects, property names become column headers. For array of arrays, generic column headers (A, B, C...) are created, or you can specify custom headers.

Can I preview the Excel structure before downloading?
Yes, the tool provides a preview showing how your JSON data will appear in Excel format, including column headers and data organization.

Related Tools

Invoice Builder CSV to JSON Converter CSV to XLSX Converter JSON to CSV Converter Markdown Editor & Live Preview Spreadsheet Converter