Are my files uploaded?

No. Files are opened and processed by your browser on this device. Nothing is sent to a server, so it works with private documents and even offline once the page has loaded.

Can nested JSON become CSV?

CSV is flat, so nested objects are written as JSON text in their cell. Lists of flat records convert cleanly.

Nightroll

Free JSON, CSV, YAML & TOML Converter

Pick the formats, paste your data and copy the result.

CSV: the first line is the header. Separators , ; and tab are detected.

How to make a data conversion

Choose the format you have and the one you want.
Paste the data or open a file.
Copy or download the result.

Frequently asked questions

Are my files uploaded?: No. Files are opened and processed by your browser on this device. Nothing is sent to a server, so it works with private documents and even offline once the page has loaded.
Can nested JSON become CSV?: CSV is flat, so nested objects are written as JSON text in their cell. Lists of flat records convert cleanly.