Excel to JSON Converter

Convert Excel Spreadsheets to JSON Format

Excel is the world's most popular spreadsheet software, but modern web applications, APIs, and databases speak JSON. This free Excel to JSON converter bridges that gap, letting you transform spreadsheet data into structured JSON format without writing a single line of code or uploading your data to unknown servers.

Why Convert Excel to JSON?

JSON (JavaScript Object Notation) has become the standard data interchange format for web applications and APIs. Converting your Excel data to JSON enables:

• API Integration: Feed spreadsheet data directly to REST APIs and web services
• Database Import: Load data into MongoDB, Firebase, and other NoSQL databases that natively support JSON
• Web Applications: Use spreadsheet data in JavaScript, React, Vue, or Angular applications
• Data Analysis: Process Excel data with Python, Node.js, or other programming languages
• Configuration Files: Convert settings or configuration data from Excel to JSON config files

Supported File Formats

The converter handles multiple spreadsheet formats:

• XLSX: Modern Excel format (Excel 2007 and later)
• XLS: Legacy Excel format (Excel 97-2003)
• CSV: Comma-separated values, compatible with any spreadsheet software

Output Format Options

Choose the JSON structure that best fits your needs:

• Array of Objects: Each row becomes an object with column headers as keys—perfect for most applications
• Object with Row Numbers: Row numbers as keys, useful when you need to reference specific rows
• 2D Array: Raw array of arrays, ideal for matrix operations or custom processing

Flexible Configuration

The converter offers several configuration options to handle various spreadsheet layouts:

• Sheet Selection: Convert all sheets at once or select a specific sheet
• Header Row: Specify which row contains column headers (or use column letters)
• Pretty Print: Choose between readable formatted JSON or minified compact output

Data Type Handling

The converter intelligently handles different Excel data types:

• Numbers remain as numeric values in JSON
• Dates are converted to ISO format strings
• Boolean values are preserved as true/false
• Empty cells become empty strings or null values
• Formulas are evaluated—the result value is exported, not the formula

Common Use Cases

This converter is particularly useful for:

• Developers: Converting test data, mock APIs, or configuration from Excel
• Data Analysts: Preparing Excel data for processing with JavaScript or Python
• Business Users: Sharing spreadsheet data with technical teams in a universal format
• System Integrators: Building bridges between Excel-based workflows and modern systems

Privacy and Security

Unlike server-based converters, this tool processes your Excel files entirely in your browser using the SheetJS library. Your spreadsheets—which may contain sensitive business data, financial information, or personal details—never leave your computer. This makes it safe for converting confidential data.