How do I convert JSON to CSV with nested objects?

Our tool automatically flattens nested JSON objects into a flat structure using dot notation (e.g., user.name), making it perfectly compatible with Excel and Google Sheets.

Is my JSON data kept private?

Yes. Processing happens 100% in your browser. No data is ever sent to our servers, making it safe for sensitive production data.

Free Online JSON to CSV Converter | Secure Data Export

convert and flatten json data to csv format instantly. perfect for excel and google sheets.

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How to Convert JSON to CSV with Nested Objects

Our free online JSON to CSV converter is built for speed and privacy. It handles both simple flat arrays and complex nested JSON objects by automatically flattening them into a spreadsheet-friendly format using dot notation. For example, a nested structure like { "user": { "id": 1 } } is converted into a column header named user.id. This ensures your data is perfectly formatted for Microsoft Excel, Google Sheets, or data analysis in Python and R.

Spreadsheet Optimized

Automatic recursive object flattening
Support for large JSON arrays
Excel-compatible CSV escaping
Handles null values and sparse arrays gracefully
Instant visual preview before download

Privacy by Design

100% Client-side conversion
No data is uploaded to any server
Secure processing of sensitive API exports
Works offline once loaded

Frequently Asked Questions

What happens to nested JSON objects?

Our converter uses a recursive flattening algorithm. It traverses every depth of your JSON and combines keys with a dot (.) separator to create unique CSV columns, preserving all your data hierarchy in a flat format.

Is there a file size limit?

Since the conversion happens in your browser's memory, the limit is based on your device's available RAM. For most users, it can easily handle JSON files up to 50MB-100MB instantly.

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