Developer Tools
NDJSON Viewer
Browse newline-delimited JSON as a table; convert to/from JSON arrays.
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About this tool
NDJSON (one JSON value per line) is the format of log files, ML datasets, and streaming APIs. Drop a file or paste the contents and explore as a table with column auto-detection. Convert to a JSON array, or convert a JSON array into NDJSON for piping into tools like jq.
Frequently asked questions
What is NDJSON?
NDJSON (Newline-Delimited JSON, also called JSONL) is one valid JSON value per line. It's used for logs, ML datasets, and streaming APIs because each line is independently parseable.
How big a file can I open?
Browsers comfortably handle hundreds of MB of NDJSON. Very large files (multi-GB) can OOM — split them first.