Scanning through raw server logs line by line to find the requests that matter is slow and error-prone. This tool parses common log formats into a structured table you can filter and sort, without uploading anything to a server.
What Is the Log File Analyzer?
Log File Analyzer is one of the tools in WebdevToolbox’s DevOps category. Paste nginx (combined log format), Apache (common log format), or JSON-lines logs and get a structured, filterable table plus aggregate counts of top status codes and top request paths.
How to Use It
- Open the tool at /tools/log-analyzer.
- Paste your log lines — format is auto-detected per line.
- Use the search box to filter by path or IP, and the status field to filter by response code.
- Check the sidebar for top status codes and top paths across all parsed lines.
Key Features
- Auto-detected format — tries combined log format, then common log format, then JSON-lines, per line.
- Live filtering — search and status filters update the table instantly.
- Aggregate panels — top status codes and top paths by frequency, computed from every parsed line (not just the visible rows).
- Unparsed line tracking — the summary line shows how many lines couldn’t be matched to a known format.
- 100% client-side — logs never leave your browser, even if they contain IPs or paths you’d rather not upload anywhere.
When to Use the Log File Analyzer
- Debugging a spike in errors — paste a chunk of logs and immediately see the top status codes.
- Finding hot paths — spot which endpoints are getting hit hardest without writing a one-off script.
- Reviewing access patterns — filter by IP or path fragment to trace a specific client’s requests.
Try It Now
Open Log File Analyzer directly from anywhere on the site using ⌘K and typing the tool name. No login required — everything runs offline-capable in your browser.
Part of the DevOps Tools collection on WebdevToolbox — free, browser-based developer tools with no login required.