JSONL Formatter
Pretty-prints JSON Lines data — formats each line as indented JSON for debugging, log analysis, and streaming data inspection.
How to Use the JSONL Formatter
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Frequently Asked Questions
JSONL vs NDJSON?
Same format, different names (JSON Lines = NDJSON). This tool pretty-prints each line in place; the converter merges lines into arrays.
Invalid lines flagged?
Yes with line numbers — fix the source exporter rather than hand-editing thousands of lines. Systematic errors indicate schema drift.
Large log files?
Hundreds of thousands of lines format progressively. Billion-line archives need command-line tools, not browser tabs.
Are my logs uploaded?
No — formatting runs locally in your browser. Logs never leave your device.
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Last updated October 2026