Four browser-based utilities to format, filter and validate JSON/NDJSON logs, and convert Nginx/Apache access logs to CSV/TSV. For single-document JSON see also JSON formatter and JSON validator.

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Format JSON Logs

Pretty-print a JSON document or normalize NDJSON — indent for single documents only.

Filter JSON Logs

Filter NDJSON by level and substring — invalid lines skipped.

Validate NDJSON

Validate NDJSON: report counts or extract valid lines.

Access Log to Table

Parse combined/common access logs into CSV or TSV.

Also useful (single JSON document)

JSON formatter JSON validator