JSON to Excel Converter
Convert JSON data to Excel spreadsheets instantly. Flatten nested objects, arrays, and complex JSON structures into clean .xlsx files with auto-generated headers. 100% client-side.
JSON to Excel Converter
JSON to Excel Converter is a 100% browser-based tool that transforms JSON arrays and nested objects into clean Excel (.xlsx) spreadsheets. No data is sent to any server — all conversion happens locally via Web Workers. Supports flat table output for easy data analysis, and automatically generates column headers from JSON keys.
How to Convert JSON to Excel
- Paste your JSON data (an array of objects or a single object) into the input textarea on the left.
- Click the 'Convert to Excel' button to flatten and transform your JSON into a tabular format.
- Download the result as .xlsx, or copy as CSV. Use the preview pane to inspect the table before export.
Frequently Asked Questions
Got questions about JSON to Excel conversion? We've got answers.
What types of JSON can I convert to Excel?
You can convert JSON arrays of objects (e.g., [{...}, {...}]), nested objects with sub-arrays, or single objects. Nested structures are automatically flattened with dot-notation headers (e.g., 'address.city').
Is my data safe during conversion?
Absolutely. The conversion runs entirely in your browser via a Web Worker. Your JSON data is never uploaded to any server, stored, or logged. All processing stays within your browser tab.
How are nested objects handled?
Nested objects are flattened using dot notation for column headers. For example, a field 'person.address.city' becomes a column named 'person.address.city'. Arrays within objects are serialized as JSON strings in the cell.
Can I handle large JSON files?
Yes. Since the tool runs locally in your browser, performance depends on your device. Files up to several megabytes work well. The tool has a built-in character limit of 5,000,000 characters to prevent browser crashes.
Tool Changelog & Updates
- Feature: Initial release: Convert JSON arrays/objects to Excel .xlsx files
- Feature: Flatten nested objects with dot-notation headers
- Feature: CSV preview pane with inline table visualization
- Feature: Web Worker based conversion with epoch token anti-race protection
- Feature: Load JSON from remote URL
- Feature: 5,000,000 character hard cap for browser safety
- Feature: Preview truncated at 5,000 rows with full download support
- UX: Dual-pane layout with stats telemetry (rows, cols, size, keys)
- UX: Dark mode support via CSS variables