NDJSON / JSON Lines Viewer — Free Online
Parse and inspect newline-delimited JSON (NDJSON / JSON Lines). Highlight invalid lines, preview each record as a tree, and convert valid lines to a JSON array.
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NDJSON / JSON Lines
Explorer
Lines
Paste NDJSON to list lines.
Line preview
Select a valid line to preview its tree, or convert all lines to a JSON array.
About this tool
Line-by-line parseInvalid line highlightTree previewTo JSON arrayDownload
How to use
- Paste one JSON value per line (NDJSON / JSONL).
- Review valid and invalid line counts in the header.
- Click a line to preview it, or convert all valid lines to a JSON array.
Examples
Log stream
{"event":"login"}
{"event":"logout"}2 valid lines → JSON array