Local log analysis guide
Nginx log analyzer for access and error files
Inspect Nginx access logs, error logs and rotated GZIP archives in your browser. Find failed requests and upstream problems without uploading production data.
Nginx investigations usually start with a narrow question: which route returned 502, which upstream timed out, or whether one client generated a burst of requests. A local viewer lets you answer those questions without moving the log to another service.
Log Voyager works with standard combined access logs and plain-text error logs. It does not require a fixed log_format; search and filters operate on the text your Nginx configuration actually emits.
Files and formats
access.log · error.log · access.log.gz · error.log.gz
Common investigation tasks
Find server errors
Search HTTP 500, 502, 503 and 504 responses, then inspect surrounding requests.
Trace an upstream timeout
Locate upstream timed out, connect failed and prematurely closed connection messages.
Inspect one path or client
Filter by request URI, host, user agent or client IP address.
Review rotated archives
Open a GZIP log directly without first extracting a second copy to disk.
A practical workflow
- Choose access or error log - Open the file or a rotated .gz archive directly from your device.
- Search the failure class - Start with a status code, upstream phrase, path, IP address or request ID.
- Compare nearby entries - Use bookmarks and split view to keep related events visible.
- Export incident evidence - Save only the requests and errors relevant to the investigation.
Frequently asked questions
Does it parse custom Nginx log_format values?
The viewer does not require a fixed schema. It displays and searches the exact text produced by your configured log_format.
Can I inspect Nginx GZIP archives?
Yes. Rotated .gz logs can be opened and decompressed locally in the browser.
Can it calculate traffic dashboards?
Log Voyager is designed for interactive inspection and filtering, not persistent traffic analytics. Use it to isolate evidence, then export the relevant subset.