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Multi-Format Log Parser

Developer Tools

Auto-detect parser

What is Multi-Format Log Parser?

Multi-Format Log Parser auto-detects and parses structured data from mixed log formats. Log files come in many shapes: nginx combined access logs, Apache logs, syslog RFC 3164, logfmt key=value pairs, and JSON lines. This tool tests each incoming line against all supported parsers and outputs a normalized JSONL (JSON Lines) format - one JSON object per line. The result is a structured dataset you can query, filter, and analyze in any tool that understands JSON.

How it works

Each line is tested in sequence against regex patterns for nginx, Apache, and syslog formats. If those fail, it's tested as logfmt and then JSON. The first successful parse wins. Unmatched lines are output as { _raw: '...' } so nothing is lost. All parsing happens in a Web Worker to keep the UI responsive.

Features & Benefits

  • Auto-detects nginx, Apache, syslog, logfmt, and JSON log formats
  • Bulk processing - handles thousands of lines at once
  • Unmatched lines are preserved as { _raw: '...' } - nothing is silently dropped
  • Runs entirely in your browser via a Web Worker - logs never leave your device

Frequently Asked Questions

What formats are supported?

JSON lines, logfmt (key=value), syslog RFC 3164, nginx combined access log, and Apache combined access log. Each line is tested in that order and the first match wins.

What happens to lines that don't match any format?

They are output as { "_raw": "...", "_parser": "none" } so nothing is silently dropped. You can filter them out of the JSONL output afterward.

Is my log data uploaded anywhere?

No. Parsing runs in a Web Worker in your browser. Your log data never leaves your device.

Can I mix different log formats in one file?

Yes. Each line is parsed independently, so a file with a mix of nginx and syslog lines is handled correctly.

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