Drop your Excel file here
or click to browse • .xlsx, .xls supported
Your JSON output will appear here
How Your Result Was Calculated
Ready to Convert
Upload an Excel file to see JSON output, statistics, and conversion details.
Guide
How to use the Excel to JSON converter in three steps
1. Upload Your File
Drag and drop an .xlsx or .xls file onto the upload area, or click to browse. The file is processed entirely in your browser — nothing is uploaded to any server.
2. Configure Options
Select the target sheet from the dropdown, choose your preferred output format (Array of Objects, Keyed Object, or Raw 2D Array), and click Convert.
3. Export Your JSON
Preview the structured JSON output, copy it to clipboard with one click, or download it as a .json file for use in your projects.
Facts
Key information about Excel to JSON conversion
Processing Speed
Files are parsed using the SheetJS library directly in your browser. A typical spreadsheet with 10,000 rows converts in under one second. Performance depends on file size and your device.
Privacy & Security
All processing happens client-side. Your data never leaves your device. No file is uploaded, stored, or transmitted — making this tool safe for sensitive or confidential spreadsheets.
File Format Support
Supports .xlsx (Excel 2007+) and .xls (Excel 97-2003) formats. Maximum tested file size is 50MB. Larger files may affect browser performance depending on available memory.
Multi-Sheet Handling
Automatically detects all sheets in your workbook. You can select which sheet to convert. Each sheet is converted independently, giving you full control over the output.
Use Cases
Practical applications for Excel to JSON conversion
API Development
Convert spreadsheet data into JSON payloads for REST API testing, mock data generation, or seeding databases with structured records.
Data Analysis
Transform Excel reports into JSON for programmatic analysis, visualization libraries (D3.js, Chart.js), or feeding into data processing pipelines.
Web Development
Import spreadsheet content directly into web applications. Perfect for CMS imports, configuration files, i18n translation tables, and static site data.
Database Migration
Prepare Excel data for database import by converting to JSON, then use with tools like MongoDB Compass, Firebase imports, or PostgreSQL JSON functions.
Legacy Data Migration
Extract data from legacy Excel-based systems and convert to modern JSON format for cloud platform migration and digital transformation projects.
IoT & Automation
Convert configuration spreadsheets or sensor data logs from Excel to JSON for IoT device configurations, automation scripts, and pipeline integration.
Tips
Best practices for clean JSON conversion
Use Headers in Row 1
For the best Array of Objects output, ensure your first row contains column headers. These become JSON property names. Clean, unique headers produce the most readable JSON.
Avoid Merged Cells
Merged cells can cause unexpected behavior during conversion. Unmerge cells before uploading, or use the Raw Values output format to handle edge cases.
Clean Your Data First
Remove empty rows, standardize date formats, and ensure consistent data types within columns. This produces cleaner JSON with predictable property types.
Use Keyed Mode for Lookups
If your data has a unique identifier column, use the "Keyed by First Column" format. This generates a JSON object where each key is the ID — perfect for lookup tables.
Examples
See what the JSON output looks like for different spreadsheet structures
Employee Directory
A spreadsheet with columns: Name, Department, Role, Salary. The Array of Objects format generates:
{ "Name": "Alice", "Department": "Engineering", "Role": "Developer", "Salary": 85000 },
{ "Name": "Bob", "Department": "Marketing", "Role": "Designer", "Salary": 72000 }
]
Product Catalog
Using Keyed by First Column format with Product ID as the key:
"P100": { "Name": "Widget", "Price": 19.99, "Stock": 150 },
"P101": { "Name": "Gadget", "Price": 29.99, "Stock": 85 }
}
About This Tool
Why this tool exists and how it works
Excel to JSON Converter
This tool was built to solve a common developer pain point: converting spreadsheet data into structured JSON without relying on external servers or uploading sensitive data to third-party services.
Built with SheetJS (xlsx) for parsing, it runs entirely in your browser using JavaScript. The tool automatically detects column types, handles multiple sheets, and offers three output formats to suit different use cases — from simple arrays to keyed lookup objects.
Created by Anjani Kumar Mishra as part of a portfolio of developer utilities.
| Feature | Details |
|---|---|
| Price | Free |
| Rendering | Client-Side Rendering |
| Language | JavaScript |
| Paywall | No |
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