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JSON to CSV Converter - Convert JSON Arrays to CSV Online

Input must be a JSON array of flat objects, e.g. [{"name": "Alice", "age": 30}]

Switch to CSV → JSON
Input JSON
CSV Output

About the JSON to CSV Converter

Spreadsheets remain one of the most universal ways to analyse and share tabular data. But APIs and databases often deliver data as JSON arrays. The JSON to CSV Converter transforms JSON arrays of objects into clean, RFC 4180-compliant CSV that opens perfectly in Excel, Google Sheets, LibreOffice Calc, or any data analysis tool.

The conversion happens entirely in your browser. Your data is never uploaded to a server, making this tool safe for datasets that contain personal information, financial records, or proprietary business data.

How to Use the Converter

Paste a JSON array of objects into the input editor. The converter automatically detects all keys across every object and uses them as column headers. The resulting CSV appears in the output pane. From there you can copy the text to your clipboard or download it as a .csv file. The file is ready to import into any spreadsheet application or data pipeline.

Features

  • Automatic column detection. All unique keys across every object are collected and used as CSV headers.
  • Nested object flattening. Nested properties are flattened with dot-notation column names (e.g., address.city).
  • RFC 4180 compliance. Proper escaping of commas, quotes, and newlines ensures the output is valid CSV.
  • Download as file. Export the result directly as a .csv file without leaving the page.
  • Client-side only. No data is sent to any server; your dataset stays private.

Common Use Cases

Data analysts frequently need to pull JSON from an API and open it in a spreadsheet for quick exploration. Product managers export analytics events as JSON and convert them to CSV for pivot table analysis. QA engineers transform test result JSON into CSV reports for stakeholders. And anyone migrating data between a JSON-based system and one that accepts CSV imports will find this converter useful.

Frequently Asked Questions

What JSON structure works best for CSV conversion?
The ideal input is a JSON array of flat objects, where each object represents a row and each key becomes a column header. For example: [{"name":"Alice","age":30},{"name":"Bob","age":25}]. Nested objects are flattened using dot notation for column names.
How are nested objects handled?
Nested objects are flattened into dot-delimited column names. For example, an object with {"address":{"city":"London"}} would produce a column named 'address.city'. Arrays within objects are serialised as JSON strings in the CSV cell.
Can I download the CSV file?
Yes. After conversion, you can copy the CSV text to your clipboard or download it directly as a .csv file that opens in Excel, Google Sheets, or any other spreadsheet application.
What if my JSON objects have different keys?
The converter collects all unique keys across every object in the array and uses them as column headers. If an object is missing a key, the corresponding CSV cell is left empty, ensuring a consistent tabular structure.
Does the converter handle special characters in values?
Yes. Values containing commas, double quotes, or newlines are properly escaped according to RFC 4180 (the CSV standard). Double quotes within values are doubled, and the entire field is wrapped in quotes.