JSONL Explained: The Line-by-Line Format Powering AI Datasets

You're trying to load a 500,000-record dataset into your script. You reach for JSON — it's universal, readable, everyone knows it. But the moment you call JSON.parse() on a 2 GB file, your process runs out of memory and crashes. This is the problem JSONL (JSON Lines) was built to solve. And if you'r