I saw a reference to JSONL recently and looked it up and thought "that's just Go's json.Encoder format". Which it is.
jsonlines.org was created in 2013. github.com/ndjson/ndjson-spec's earliest commit is also 2013.
But Go implemented newline-separated JSON in April 2010.
Now I'm curious: did the concept originate with Go? Was it the earliest implementation?