[ydant]

Or JSON lines - whose website looks very similar to NDJSON's:

https://jsonlines.org/

This format works great when using Amazon Athena (Presto) against log files written with one JSON object per line.

[quietbritishjim]

Both the websites are fancy ways of saying "one JSON object per line". The idea of laying out data that way was in common use before either of the website, they're just recording the practice.