Free Online Tool

JSON to Excel Converter

Convert JSON data into clean, structured Excel spreadsheets. Upload a JSON file or paste your data directly — supports nested objects, arrays, and auto-type detection.

JSON Input
Upload a .json file or paste your JSON data below. All processing happens locally.

Share this tool

Conversion Options
Configure how JSON maps to Excel

Apply bold formatting to the header row

Automatically size columns to fit content

Detect numbers, dates, and booleans from string values

Features

Everything you need to convert JSON to Excel

Local Processing

All conversion happens in your browser. Your data never leaves your device — 100% private.

Upload or Paste

Upload a .json file or paste JSON data directly from your clipboard. Perfect for quick conversions.

Smart Flattening

Automatically flatten nested JSON objects into dot-notation columns like 'address.city' for clean spreadsheets.

Array Support

Handle arrays by expanding to rows, joining as strings, or keeping as raw JSON in cells.

Type Detection

Smart detection of numbers, dates, and booleans for proper Excel cell formatting and formulas.

No Installation

Works directly in your browser. No plugins, downloads, or software needed.

How to Convert JSON Data to Excel Spreadsheets

JSON to Excel Converter is a free, privacy-first online tool that transforms JSON data into clean, structured Excel spreadsheets. No login or registration needed — just upload your JSON file or paste data directly, configure your options, and download the XLSX output. Whether you need to convert API responses, database exports, or configuration files into spreadsheets for analysis, our tool handles it all — directly in your browser with zero uploads to any server.

What Is JSON to Excel Converter?

JSON to Excel Converter is a web-based application that converts JSON data into Excel (XLSX) spreadsheets without installing any software. Unlike server-based solutions that require uploading your data, our converter processes everything locally in your browser using JavaScript and the ExcelJS library. Simply paste your JSON or upload a file, choose your format options, and download the structured Excel file.

How Does JSON to Excel Conversion Work?

Our converter reads your JSON data, analyzes its structure, and maps it to Excel rows and columns. Nested objects are flattened using dot-notation headers (e.g., 'address.city'), arrays can be expanded into separate rows or joined as strings, and data types are automatically detected for proper Excel formatting. The result is a clean, ready-to-use XLSX spreadsheet.

Why Choose Our JSON to Excel Converter?

  • 100% Private — Your data never leaves your device. All processing happens locally in your browser using JavaScript.
  • Completely Free — No hidden fees, no watermarks, no file size limits, no signup required.
  • Dual Input Mode — Upload a .json file or paste JSON data directly from your clipboard.
  • Smart Flattening — Nested objects are automatically flattened into clean dot-notation column headers.
  • Array Support — Expand arrays to rows, join as strings, or keep as raw JSON strings.
  • Auto Type Detection — Numbers, dates, and booleans are detected and formatted properly in Excel cells.
  • No Installation Required — Works directly in your web browser on any device.

FAQ

What JSON formats are supported?+
Our tool supports JSON arrays of objects (most common), single objects, and nested JSON structures. Arrays of objects are the ideal format where each object becomes a row in Excel.
Is this JSON to Excel converter free?+
Yes, completely free! There are no hidden fees, no watermarks, no file size limits, and no signup required. You can convert as much data as you need.
Is my data uploaded to a server?+
No! All processing happens entirely in your browser using JavaScript. Your data never leaves your device. This makes it safe for confidential and sensitive data.
How are nested JSON objects handled?+
Nested objects are flattened using dot-notation. For example, { address: { city: 'NYC' } } becomes a column called 'address.city' with the value 'NYC'. You can configure the flatten depth in the options.
How are arrays handled in JSON?+
You have three options: expand each array item into separate rows, join array values as a comma-separated string in one cell, or keep the raw JSON string in the cell.
Can I paste JSON directly instead of uploading?+
Yes! Switch to the 'Paste JSON' tab and paste your JSON data directly into the text editor. This is perfect for quick conversions from API responses or clipboard data.
What Excel features are supported?+
The output XLSX file supports bold headers, auto-sized columns, proper number and date formatting, and multiple sheets. All generated using the ExcelJS library.
Is there a file size limit?+
Since processing happens in your browser, there is no strict limit. However, very large JSON files may be slower depending on your device's memory. We recommend files under 50MB for optimal performance.