Pulsars

JSON to CSV Converter — Export JSON as Spreadsheet Data

JSON5 lines
CSV2 lines

Converting JSON to CSV transforms structured key-value data into a flat tabular format compatible with spreadsheet applications like Excel, Google Sheets, and LibreOffice Calc. Each JSON object becomes a row, and each unique key becomes a column header. This conversion is widely used for data analysis, reporting, and exporting API responses into formats that business teams can work with.

How does JSON-to-CSV conversion handle nested objects?

Flat JSON arrays convert directly to CSV rows. Nested objects are typically flattened using dot notation (e.g., address.city becomes a column header). Arrays within objects are joined as comma-separated strings. This converter handles both flat and moderately nested JSON structures automatically.

Frequently Asked Questions

What JSON structure works best for CSV conversion?

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An array of flat objects works best — each object becomes a row, and the keys of the first object become CSV headers. For example: [{"name": "John", "age": 30}, {"name": "Jane", "age": 25}] produces a clean 2-column CSV. Nested objects and arrays are converted to their string representation.

Can I convert a single JSON object (not an array)?

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Yes. A single object is treated as a one-row CSV. The keys become headers and the values become the single data row. If you have deeply nested JSON, consider flattening it first for cleaner CSV output.

How are special characters handled in CSV output?

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Fields containing commas, double quotes, or newlines are automatically wrapped in double quotes per the RFC 4180 standard. Any double quotes within a field are escaped by doubling them. This ensures the CSV is valid and can be opened in Excel, Google Sheets, or any CSV parser.

Can I download the CSV file?

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Yes! Click the download button (↓) next to the Copy button on the result panel. The file is generated directly in your browser and downloaded as a .csv file — nothing is uploaded to a server.

Is this converter safe for sensitive data?

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Yes, all processing happens locally in your browser. No data is transmitted to any server. Your JSON and CSV content stays entirely on your device.