JSON Lines (JSONL) Viewer
Paste JSON Lines — one JSON value per line, as used in ML datasets and log streams — to validate each line and view them as a pretty-printed array.
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How to use it
Paste JSONL content and click Parse. Blank lines are skipped. If a line fails to parse, the exact line number and error are reported so you can find and fix it without scanning the whole file.
Frequently Asked Questions
What's the difference between JSONL and a JSON array?
A JSON array is one document that must be fully valid to parse at all. JSONL is one independent JSON value per line, so a streaming reader can process line 1 before line 1000 even exists yet — and one bad line doesn't break the rest.