JSON ⇄ CSV Converter
Convert between JSON arrays and CSV: nested objects flattened, quotes and line breaks handled, leading zeros kept, and CSV injection flagged.
Runs in your browser: input and output are never sent to the server, and the platform does not store your input.
Output
Fill in the fields on the left, then run.
How to use
- 1Paste a JSON array or a CSV with a header row; the direction is detected automatically.
- 2Change the delimiter if needed — European Excel often uses semicolons.
- 3Copy or download the result.
FAQ
How do nested objects become CSV?
They are flattened into a.b columns such as address.city; arrays are stored as a JSON string in one cell, so nothing is lost on the way back.
Excel shows garbled characters?
Excel opened the UTF-8 file with the wrong encoding. Use Data → From Text/CSV and choose UTF-8, or open it in Google Sheets.
What is CSV injection?
Cells starting with = + - @ may run as formulas in Excel. Take care when exporting user-supplied data; the tool flags it when it sees one.
Is my data uploaded?
No. The conversion runs entirely in your browser, so it is fine for internal data.