In-browser tool

JSON to CSV

Flatten a JSON array of objects into CSV — on your device, instantly.

Everything runs in your browser — your input is never uploaded.

How it works

Type or paste your input

Get the result instantly

Copy the result

What about nested objects?

Nested values are kept as JSON text inside the cell; the header is the union of every object's keys.

Is my file uploaded to a server?

No. This tool runs entirely in your browser. You can open your browser's network tab and verify no request carries your file.