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Generators & Utilities

NDJSON / JSON Lines Converter

Convert between JSON arrays and newline-delimited JSON (NDJSON/JSONL) used in logs and streaming.

Runs entirely in your browser — your data never leaves your device.

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How to use this tool

  1. 1Paste a JSON array or NDJSON into the editor.
  2. 2Choose the conversion direction.
  3. 3Copy or download the result.

Frequently asked questions

What is NDJSON?
Newline-delimited JSON stores one JSON object per line, which is ideal for streaming, logs, and large datasets.
Where is NDJSON used?
Log pipelines, BigQuery exports, and machine-learning datasets commonly use NDJSON/JSONL.
Is my data uploaded to a server?
No. Every tool on JSONPost runs entirely in your browser using JavaScript. Your JSON never leaves your device, so it is safe to use with private or sensitive data.

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