XLSX to JSON Converter [2025]

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Create structured JSON from Excel files with intelligent data detection. Perfect for API development, data modeling, and system integration.

✓ Nested Objects✓ Array Detection✓ API-Ready Output

Smart Structure Detection

Nested Objects

Convert dot notation fields into nested JSON objects automatically:

user.name → {
  "user": {
    "name": "value"
  }
}

Array Detection

Automatically detect and parse array values in cells:

[1,2,3] → {
  "numbers": [1, 2, 3]
}

Advanced Features

Data Structure

  • • Nested object creation
  • • Array field detection
  • • Custom root wrapping
  • • Null value handling

Formatting

  • • Pretty printing
  • • ISO date conversion
  • • Whitespace control
  • • Special char handling

Integration

  • • API-ready output
  • • Standard compliance
  • • Schema detection
  • • Structure validation

Data Modeling Examples

User Data Structure

Excel Columns:

user.id
user.name
user.contact.email
user.contact.phone
user.roles[]

JSON Output:

{
  "user": {
    "id": "123",
    "name": "John Doe",
    "contact": {
      "email": "john@example.com",
      "phone": "555-0123"
    },
    "roles": ["admin", "user"]
  }
}

Common Use Cases

API Development

Create structured data for API endpoints and testing:

  • Mock API responses
  • Test data generation
  • Data seeding
  • Schema validation

Data Migration

Convert legacy Excel data to modern JSON formats:

  • NoSQL database imports
  • System migrations
  • Data restructuring
  • Format modernization

JSON Structure Guide

Learn how to structure your Excel data for optimal JSON conversion:

Nested Objects

  • Use dot notation in column headers
  • Example: user.address.city
  • Creates nested object structure
  • Unlimited nesting depth

Array Values

  • Use square brackets in values
  • Example: [1,2,3] or ["a","b","c"]
  • Automatic array detection
  • Supports nested arrays

Frequently Asked Questions

How are nested objects created?

The converter uses dot notation in column headers to create nested JSON objects. For example, "user.name" and "user.email" will be grouped into a "user" object with "name" and "email" properties.

What about array detection?

The converter automatically detects array values in cells when they're formatted with square brackets. You can also append "[]" to column names to indicate array fields. Arrays can contain numbers, strings, or even nested objects.

How are dates handled?

Excel dates are automatically converted to ISO 8601 format (YYYY-MM-DD) by default. This ensures compatibility with most APIs and databases while maintaining data type accuracy.

Is the output standard-compliant?

Yes, the generated JSON strictly follows the JSON standard specification. All special characters are properly escaped, and the output is validated to ensure it can be parsed by any standard-compliant JSON parser.

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