JSONL

JSONL is a text format that stores one JSON record per line, commonly used for logs and datasets.

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JSONL, or JSON Lines, is a text format in which each line contains one valid JSON value. Unlike a conventional JSON file containing a single JSON value, it separates records by line so they can be appended or read sequentially.

In AI, JSONL is used for conversation histories, training datasets and records of model inputs and outputs.

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Claude Code saves transcripts as JSONL files, a format with one JSON record per line.


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