Validate NDJSON Online — Report or Extract Valid Lines
Validate NDJSON: max lines, strict or skip bad lines, report counts or extract valid lines — entirely in your browser.
Developer notes
• onBadLine controls strict vs skip; validation report and extracted valid lines are always shown together. • strict → failed run and empty right editor when any line is bad. • skip → compact valid lines in the right editor; issues listed in the report panel. • Extract never pretty-prints. • Copy, Download, and Expand (small buttons) above each editor. • Debounced ~300 ms while typing or changing options. • Load sample sets skip: 10 lines, 3 bad (truncated JSON, plain text, invalid keys) — line numbers match non-empty rows in the editor. • strict fails the whole run when any line is bad.
Options
When teams pick this route
• Verify an NDJSON export before upload. • Split valid lines out of a contaminated stream (skip mode). • Cap work with maxLines before pasting huge dumps. • Download the salvaged valid NDJSON from the right editor.
Worked examples
Mixed stream — skip + report (Load sample)
Input
Result
Strict report on bad line
Input
Result
Navigate related log tools
Format with format JSON logs, filter via filter JSON logs, or open the logs hub.
NDJSON validator FAQ
Strict, skip, extract
Is there a separate split-ndjson tool?
No. Use onBadLine skip — valid lines appear in the right editor while the report lists bad rows.
What if I exceed maxLines?
Validation fails with an error citing count vs max. Lines are never silently truncated.
Does extract pretty-print?
No — extracted lines are always compact JSON.stringify output.
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