Pretty-prints JSON Lines data — formats each line as indented JSON for debugging, log analysis, and streaming data inspection.
Content reviewed October 2026 · About Toolzum
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Same format, different names (JSON Lines = NDJSON). This tool pretty-prints each line in place; the converter merges lines into arrays.
Yes with line numbers — fix the source exporter rather than hand-editing thousands of lines. Systematic errors indicate schema drift.
Hundreds of thousands of lines format progressively. Billion-line archives need command-line tools, not browser tabs.
No — formatting runs locally in your browser. Logs never leave your device.
NDJSON to JSON Array
Convert newline-delimited JSON streams to JSON arrays for analysis. Turn 10,000 log lines into queryable data — local conversion, free, no signup.
JSON Formatter
Pretty-prints raw JSON with configurable indent width, key sorting, and bracket collapsing options while flagging syntax errors with exact.