Are you aware that the mongodb database uses newline delimited json for exporting/importing (potentially large) datasets? See for example zips.json. How does this relate to ndjson? Can the mongoimport be considered an ndjson parser?

It might be helpful to cross-reference them somewhere. I asked for a term for this format a while ago and nobody pointed me to ndjson.

I have also implemented a stream parser for this format in R in the jsonlite package.