Free Online Tool

Excel to JSON Converter

Convert your Excel (XLS, XLSX) and CSV spreadsheets into structured JSON data. Configure arrays, objects, and nested fields with advanced parsing options.

File Upload
Upload your Excel or CSV file. All processing happens locally in your browser.

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Advanced Options
Configure JSON output format
Data Parsing Rules

Converts "address.city" headers into nested objects

Converts numeric strings to Numbers, and boolean strings to true/false.

Output Excel serial dates directly instead of ISO date strings.

Features

Everything you need to convert Excel files to JSON

Local Processing

All conversion happens in your browser. Your files never leave your device — 100% private.

Multi-Sheet Support

Select and convert specific sheets from multi-sheet workbooks into structured JSON output.

Nested JSON

Automatically convert dot-notation headers like "address.city" into deeply nested JSON objects.

Flexible Output

Choose from flat arrays, object dictionaries, or wrapped root objects to match your data needs.

Smart Type Parsing

Auto-detect and convert numbers, booleans, and dates from string values in your spreadsheet.

No Installation

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

Excel to JSON Converter Online — Convert XLSX & CSV Instantly

Need a fast, reliable way to convert excel to json? This free Excel to JSON Converter turns your spreadsheets into clean, structured code in seconds — no signup, no server uploads. Built for developers and data analysts, it handles XLSX, XLS, and CSV files alike, letting you export tabular data into arrays, objects, or nested structures directly inside your browser.

What Is This Excel to JSON Converter?

This Excel to JSON Converter is a browser-based utility that transforms spreadsheet rows and columns into developer-friendly JSON. It doubles as a full CSV to JSON converter, and because everything runs locally, your confidential data never leaves your device — giving you an instant, private bridge between raw business data and your web applications.

How to Convert Excel to JSON Online?

Converting a file with this excel to json tool takes just a few clicks. Upload your spreadsheet through the drop zone, then choose your preferred output structure — flat array, object dictionary, or wrapped root. Fine-tune advanced settings like empty-cell handling, automatic type parsing, and dot-notation nesting, then hit Convert and download your finished JSON file in milliseconds.

Why Use Our Free Excel to JSON Converter?

  • 100% Secure & Private — Zero data uploads. Files are parsed locally in your browser via a Web Worker.
  • Completely Free — No paywalls, usage limits, or account registrations required.
  • Advanced Nested Objects — Automatically translate 'user.address.city' headers into deeply nested JSON schemas.
  • Smart Data Type Parsing — Accurately detect and convert numbers, booleans, and dates instead of treating everything as a string.
  • Multi-Sheet Processing — Extract and convert multiple sheets from a single Excel workbook simultaneously.
  • Zero Installation — This excel to json converter works from any device or modern browser, no downloads needed.
  • Customizable Output — Generate flat arrays for lists, or object dictionaries for multi-sheet workbooks.

FAQ

What file formats can I convert to JSON?+
This Excel to JSON Converter supports XLS (Excel 97-2003), XLSX (Excel 2007+), and CSV files. Upload any of these formats and it will parse them automatically.
Is this Excel to JSON converter free?+
Yes, completely free! There are no hidden fees, no watermarks, no file size limits, and no signup required. Convert as many files as you need.
Are my files uploaded to a server?+
No! Every conversion happens entirely in your browser using JavaScript, so your files never leave your device — safe for confidential spreadsheets.
What JSON output formats are available?+
Three formats: Flat Array (rows from the first selected sheet), Object Dictionary (all selected sheets as keys), and Wrapped Root Object (data nested under a root 'data' key).
Can I convert multiple sheets at once?+
Yes! Upload a multi-sheet workbook, select which sheets to include, then use Object Dictionary or Wrapped Root format to convert excel to json across all of them at once.
What does dot-notation nesting mean?+
If your spreadsheet has headers like 'address.city' or 'user.name.first', the converter automatically expands them into nested JSON objects like { address: { city: ... } }. This can be toggled on or off.
How are empty cells handled?+
Three options: omit the key entirely, set the value to null, or set it to an empty string — pick whichever fits your downstream data processing.
Can I minify the JSON output?+
Yes! Choose 2 spaces (standard), 4 spaces, or minified (no spaces) for the most compact output — ideal for API payloads and production use.