# Big Log Explorer — Variant Guides

For the full tool, see: [https://capytoolkit.com/tools/developer/log-explorer/](https://capytoolkit.com/tools/developer/log-explorer/)

## Big Log Explorer Reference

[JSON Lines (JSONL) Log Format](https://capytoolkit.com/tools/developer/log-explorer/reference/#jsonl-log-format): JSON Lines stores one JSON object per line, the default of Pino, Winston, and Bunyan. Learn the structure, why loggers adopted it, and how to open large JSONL files.
[Common Log Format (CLF)](https://capytoolkit.com/tools/developer/log-explorer/reference/#common-log-format): The Common Log Format is the NCSA standard for web-server access logs. Learn each field, the bracketed date syntax, and how HTTP status codes map to log severity.
[Combined Log Format](https://capytoolkit.com/tools/developer/log-explorer/reference/#combined-log-format): The Combined Log Format extends CLF with the referer and user agent. Learn the two extra fields, how it differs from Common Log Format, and how the tool parses it.
[ISO 8601 Log Timestamps](https://capytoolkit.com/tools/developer/log-explorer/reference/#iso-8601-log-timestamps): ISO 8601 timestamps make log lines sortable and unambiguous. Learn the date-time syntax, the Z and offset designators, and how the tool parses ISO-prefixed lines.
[Syslog Format (RFC 5424)](https://capytoolkit.com/tools/developer/log-explorer/reference/#syslog-format): Syslog encodes a priority, timestamp, host, and message per line. Learn the RFC 5424 and RFC 3164 layouts, the 8 severity levels, and how to open syslog in the browser.
[Nginx Access Log Format](https://capytoolkit.com/tools/developer/log-explorer/reference/#nginx-access-log-format): The Nginx access log defaults to the combined format. Learn the log_format directive, the time_local timestamp, JSON access logs, and how to analyze them in the browser.
[Apache Log Format](https://capytoolkit.com/tools/developer/log-explorer/reference/#apache-log-format): Apache writes access logs with the common and combined nicknames and a separate error log. Learn each layout, the LogFormat directive, and how the tool parses them.
[Log Severity Levels](https://capytoolkit.com/tools/developer/log-explorer/reference/#log-severity-levels): Log levels rank messages from debug to fatal. Learn the standard hierarchy, how frameworks differ, and how the tool normalizes levels into ERROR, WARN, INFO, and DEBUG pills.

## Log Analysis Guides

[Open Large Log Files in the Browser](https://capytoolkit.com/tools/developer/log-explorer/open-large-log-files/): Multi-gigabyte logs crash editors and make grep slow. Learn how to open large log files in the browser with streaming, virtual scroll, and instant filtering. No upload.
[Search Log Files Fast](https://capytoolkit.com/tools/developer/log-explorer/search-log-files/): Search large log files instantly in the browser. Learn how indexed search stays fast across refinements and composes with level pills, the time chart, and pattern clustering.
[Find Errors in Log Files](https://capytoolkit.com/tools/developer/log-explorer/find-errors-in-logs/): Find every error in a log even when services spell severity differently. Learn how the ERROR pill, time chart, and pattern ranking surface, time, and prioritize failures.
[Analyze Nginx Access Logs](https://capytoolkit.com/tools/developer/log-explorer/analyze-nginx-access-logs/): Chart traffic, isolate 4xx and 5xx responses, and find noisy bots in a raw Nginx access log. Learn browser-based analysis with time charts, status pills, and clustering.
[Log Pattern Analysis](https://capytoolkit.com/tools/developer/log-explorer/log-pattern-analysis/): Log pattern analysis groups messages by template so you see what dominates a file. Learn how normalization builds templates and how the Patterns panel ranks and filters them.
[Triage a Production Incident From Logs](https://capytoolkit.com/tools/developer/log-explorer/incident-log-triage/): Triage a large incident log in the browser. Learn the fast sequence: isolate errors, bound the spike on the time chart, and rank the dominant failure with pattern clustering.

## Big Log Explorer: Code Examples

[Kubernetes Pod Logs](https://capytoolkit.com/tools/developer/log-explorer/code-examples/#kubernetes-pod-logs): Export kubectl logs to a file and analyze them in the browser. Merge replicas with a label selector, parse JSON logs, and debug crash loops with pattern clustering.
[Docker Container Logs](https://capytoolkit.com/tools/developer/log-explorer/code-examples/#docker-container-logs): Export Docker container logs to a file and analyze them in the browser. Understand the json-file driver, docker logs versus the raw file, Compose stacks, and journald.
[Node.js JSON Logs (Pino, Winston, Bunyan)](https://capytoolkit.com/tools/developer/log-explorer/code-examples/#nodejs-json-logs): Analyze Pino, Winston, and Bunyan JSON logs in the browser. Learn which fields parse, why numeric levels need a fix, and how to trace requests by correlation ID.
[Python Logging Analysis](https://capytoolkit.com/tools/developer/log-explorer/code-examples/#python-json-logs): Analyze Python logging output in the browser. Learn why default levels read as info, how python-json-logger and structlog fix it, and how tracebacks parse per line.
[systemd journald Logs](https://capytoolkit.com/tools/developer/log-explorer/code-examples/#systemd-journald-logs): Export systemd journal logs with journalctl and analyze them in the browser. Learn why -o json needs reshaping, when to use -o short-iso, and per-unit filtering.
[AWS CloudWatch Logs](https://capytoolkit.com/tools/developer/log-explorer/code-examples/#aws-cloudwatch-logs): Export AWS CloudWatch log events to a file and analyze them in the browser. Learn the CLI export, why the envelope charts on time, and how to unwrap JSON for level pills.