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Me too, and it's quite a common technique.

https://en.wikipedia.org/wiki/JSON_streaming

jq allows to covert normal json document to jsonlines and back, though it does it much faster if it can slurp an original doc into memory (no --stream option)

Based on this thread that's called NDJSON

Newline Delimited JSON

TIL

It's also known as JSONL (JSON Lines).

I'm pretty sure jsonl was a bit earlier as a term, but ndjson is now the more prominent term used for this... been using this approach for years though, when I first started using Mongo/Elastic for denormalized data, I'd also backup that same data to S3 as .jsonl.gz Leaps and bounds better than XMl at least.