Will commas or line breaks inside fields break the CSV?

No. The tool wraps such fields in double quotes and escapes inner quotes per the CSV spec, so Excel opens the file correctly.

How are nested object fields handled?

Nested objects and arrays are placed into the cell as JSON strings.

Do numbers turn into strings when converting CSV to JSON?

No. Pure numbers and true/false are converted to their proper types automatically; empty cells become null.

JSON to CSV Converter

Free online JSON to CSV converter with RFC4180 escaping, union-field headers, CSV-to-JSON reverse and .csv download.

Privacy: all processing happens locally in your browser. Your input never leaves your device.

What is JSON to CSV Converter?

When exporting API data for operations teams or importing it into Excel, you need to turn a JSON array of objects into a CSV table. This tool takes the union of all fields as the header row and escapes commas, quotes and line breaks per RFC4180. It also parses CSV back into JSON, auto-detecting number and boolean types. Everything runs locally, which makes it safe for exports containing sensitive business data.

How to Use

Paste a JSON array of objects (or switch to CSV-to-JSON mode and paste CSV)
The conversion runs automatically with a preview
Copy the result or download the .csv file

FAQ

Will commas or line breaks inside fields break the CSV?: No. The tool wraps such fields in double quotes and escapes inner quotes per the CSV spec, so Excel opens the file correctly.
How are nested object fields handled?: Nested objects and arrays are placed into the cell as JSON strings.
Do numbers turn into strings when converting CSV to JSON?: No. Pure numbers and true/false are converted to their proper types automatically; empty cells become null.

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Last updated 2026-09-04