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Apache/Nginx Error Log Analyzer

Auto-detect both formats, then group errors by level, category, and message.

Runs entirely in your browser — your logs never leave this page.
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About Apache/Nginx Error Log Analyzer

Apache and Nginx write their pain in slightly different dialects, but the questions are the same: what is breaking, how often, and who is affected. Apache/Nginx Error Log Analyzer auto-detects both log styles line by line, extracts the severity level and message, and organizes everything into severity counts, failure categories, top repeated messages, and the busiest clients.

Messages are normalized before grouping — request IDs, ports, and PIDs are masked — so the same failure logged a thousand times collapses into one group with a count instead of a wall of near-identical lines.

Features

  • Auto-detect Apache and Nginx formats — line by line.
  • Severity breakdown — crit, error, warn, notice.
  • Failure categorization — upstream, timeout, PHP, TLS, more.
  • Normalized message grouping — noisy fields masked.
  • Client IP ranking.
  • Local only — nothing uploaded.

How to Use

  1. Paste your error log — Apache or Nginx, or a mix.
  2. Analyze. Severity, category, and client summaries appear instantly.
  3. Drill into top messages — each group links back to sample lines.
  4. Copy the report for the ticket.

Examples

Example 1 — Nginx timeout. Repeated upstream timed out (110) entries group into one Upstream category with a count, exposing the failing backend pattern at a glance.

Example 2 — PHP fatal. A PHP Fatal error burst from one client collapses into a single group while the client IP list names the source.

Example 3 — Mixed fleet. Apache and Nginx logs stitched together are split into per-line formats automatically and analyzed together.

Benefits

  • Bilingual — one tool for Apache and Nginx.
  • De-noised grouping — reads like a report, not a raw file.
  • Category-first triage — spot the subsystem failing.
  • Client context — who is hitting the failures.
  • Private — all processing client-side.

Frequently Asked Questions

Which formats does it understand?
Both major families. Apache error logs — lines like <code>[Thu Jun 11 14:00:00 2025] [error] [pid 1234] [client IP] message</code> — and Nginx error logs — <code>2025/06/11 14:00:00 [error] 1234#0: *5 message</code>. The two formats are auto-detected line by line.
How are errors categorized?
Each message is matched against known keywords and grouped into buckets such as upstream failures, timeouts, connection errors, PHP/application errors, TLS/SSL issues, permissions, memory, and file/IO problems. Anything unmatched falls into an Other bucket so nothing is lost.
What does the report include?
Counts per severity level, counts per category, the top repeated messages (with variable parts like IPs and numbers masked), and the busiest client IPs — everything needed to triage an incident.
How are repeated messages grouped?
Raw messages are normalized first: IPs, ports, PIDs, thread IDs, and digit runs are replaced with placeholders, so messages that differ only by request ID collapse into one group with a count.
Is my data uploaded?
No. Analysis runs entirely in your browser.