FreeDev Tools

JSONL to JSON

Convert JSON Lines (NDJSON) to a pretty-printed JSON array — parse log exports and streaming data.

Runs locally in your browser. Your input is not uploaded.

How to Use

  1. 1

    Paste JSON Lines

    One JSON document per line — straight from your log export or data dump.

  2. 2

    Fix any reported line

    Malformed lines are reported with their line number.

  3. 3

    Copy the JSON array

    Use the pretty-printed array in editors, tests, or other tools.

Frequently Asked Questions

JSON Lines (NDJSON): one JSON document per line, as produced by log exporters, Elasticsearch dumps, BigQuery extracts, and streaming pipelines. Blank lines are ignored.

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