What log formats are supported?

The tool handles JSON logs, key-value pair logs, common log format (CLF), combined log format and plain text logs with timestamp prefixes. It auto-detects the format.

Can I filter by severity level?

Yes. You can filter to show only errors, warnings or specific log levels. This is useful when searching through large log outputs for critical issues.

Is my log data private?

Yes. All parsing and formatting happens in your browser. Log data often contains sensitive information like IP addresses, user IDs and error details, so client-side processing is essential.

Prettify Logs Online Free

Transform messy, single-line log output into structured, colorized and readable format. This free tool parses JSON logs, highlights severity levels and applies consistent formatting so you can find issues faster during debugging.

Open Log Prettifier

Before and After

Before (raw JSON log):
{"level":"error","ts":1700000000,"msg":"connection refused","host":"db.prod","port":5432,"retry":3}

After (prettified):
[ERROR] 2023-11-14 22:13:20
  message: connection refused
  host:    db.prod
  port:    5432
  retry:   3

Common Use Cases

Formatting JSON-structured logs from Docker containers
Parsing and colorizing Kubernetes pod logs
Making CloudWatch or Stackdriver log entries readable
Debugging application logs from CI/CD pipeline output

Frequently Asked Questions

What log formats are supported?: The tool handles JSON logs, key-value pair logs, common log format (CLF), combined log format and plain text logs with timestamp prefixes. It auto-detects the format.
Can I filter by severity level?: Yes. You can filter to show only errors, warnings or specific log levels. This is useful when searching through large log outputs for critical issues.
Is my log data private?: Yes. All parsing and formatting happens in your browser. Log data often contains sensitive information like IP addresses, user IDs and error details, so client-side processing is essential.