local / JSON array ↔ JSONL / privacy-first

Convert JSON arrays and JSONL.

Check input count, output count, and failed lines before saving the converted result locally.

Convert

Direction

Input

Paste JSON or JSONL.

Converted result

JSON arrays become one JSON value per JSONL line; JSONL becomes an array of valid lines.
Invalid JSONL lines remain as line-numbered errors and are excluded from output.
Up to 10 MiB and 10,000 items. There is no upload, external request, or automatic storage.