JSONL / NDJSON Viewer
Render newline-delimited JSON as a table, validating each line and flagging bad records.
About JSONL / NDJSON Viewer
JSONL / NDJSON Viewer renders newline-delimited JSON as a sortable table, validating each line and flagging malformed records — a fast way to inspect log exports and ML datasets.
How to use JSONL / NDJSON Viewer
- 1Paste or type your data into the input box above (a sample is pre-filled so you can try it instantly).
- 2Adjust any options on offer — delimiter, columns, formatting and so on — to match what you need.
- 3Viewing happens instantly as you type; review the result in the output panel.
- 4Click Copy to grab the output or Download to save it as a file — JSONL / NDJSON Viewer keeps everything on your device.
Why use JSONL / NDJSON Viewer?
- ✓Eyeballing a large JSONL dataset as a table
- ✓Spotting which records are malformed
- ✓Reviewing log or event exports without a script
- ✓100% free with no sign-up, no watermark and no usage limits
- ✓Runs entirely in your browser — your data is never uploaded or stored
- ✓Works offline once loaded, with instant results and one-click copy or download
Frequently asked questions
Does it validate every line?+
Yes — each line is parsed independently; valid records appear as table rows and invalid lines are clearly marked with their line number.
How are columns built?+
Every unique key across all records becomes a column, so records with different fields still align in the table.
Is it free to use?+
Yes — it is completely free with no sign-up, no account and no usage limits. There is no watermark and no paywall, so you can process as many files as you like.
Is my data private and secure?+
Yes. This tool runs entirely in your browser using client-side JavaScript — your data is never uploaded to a server, stored or logged. Once the page has loaded you can even use it offline, which makes it safe for confidential or proprietary files.
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