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NDJSON / JSON Lines vs JSON: Streaming Large Datasets, Bad-Line Recovery, NaN and Unicode in Python and jq

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Self-Hosting & Infra beginner 5 min read $0.01 Updated 2026-10-20

Tested: NDJSON written with json.dumps, per-line parsing salvaging 3 of 4 lines after a truncated record, why json.loads on the whole file says Extra data, NaN output and allow_nan, ensure_ascii, and jq -c and jq -s.

Use one JSON object per line for logs, exports and agent pipelines. Write and read NDJSON in Python, skip a corrupt line instead of losing the file, and handle NaN, ensure_ascii and jq slurping.

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