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JSON Lines Converter

JSON Lines Converter

Convert JSON Lines (NDJSON) to a JSON array and back

Direction:

JSON Lines Input

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About

Convert between JSON Lines (NDJSON — one JSON value per line) and a JSON array in either direction. Common for log streams, LLM training data, and ndjson-based APIs. Per-line parsing errors are reported with the line number. Everything runs in your browser; nothing is uploaded.

    Related guides

    JSON Lines (NDJSON): Streaming JSON for Logs, Pipelines and LLMs

    What makes one-object-per-line files different from JSON arrays, when NDJSON shines, and how to work with it in any language.

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