Question 1

How to add log level filtering to Go's standard logger?

Accepted Answer

Use logutils by setting up a LevelFilter with desired levels and MinLevel, then call log.SetOutput(filter) as shown in the README example. It integrates directly without replacing your existing logging calls.

Question 2

logutils vs logrus: which should I use for Go logging?

Accepted Answer

logutils is best for minimal enhancements to standard logging with backward compatibility, while logrus offers more features like structured logging and hooks. Choose logutils if you want to avoid framework bloat and stick close to the standard library.

Question 3

How to change log levels on the fly with logutils?

Accepted Answer

logutils does not support dynamic level changes; MinLevel is fixed at initialization. For runtime changes, you'd need to use a different logging framework or implement custom logic, as this is a known limitation.

Question 4

Can logutils output logs in JSON format?

Accepted Answer

No, logutils only filters levels and outputs plain text to writers like os.Stderr. For JSON logging, you'd need to use another package or add custom formatting layers on top.

Question 5

Is logutils thread-safe for concurrent logging?

Accepted Answer

Since it wraps the standard log package, which is thread-safe, logutils should be safe for concurrent use. However, always test in your specific application context, as the filter might introduce subtle issues.

Question 6

How to integrate logutils with an existing Go application?

Accepted Answer

Import logutils, create a LevelFilter with your desired levels and MinLevel, set it as the log output via log.SetOutput, and optionally update log messages with level tags like [DEBUG] for filtering.

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