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Guides

Logging

Buffalo logs are managed using the logrus package.

Defaults

The default logger outputs logs in a human-readable format:

INFO[2020-02-21T07:42:34+01:00] /en/ content_type=text/html duration=26.189949ms human_size="21 kB" method=GET params="{\"lang\":[\"en\"]}" path=/en/ render=22.730816ms request_id=9b8d9260225fe99609a2-7cc679f4ae458b9925e3 size=21182 status=200

Customize the logger

// JSONLogger wraps a logrus JSON logger into a buffalo Logger
func JSONLogger(lvl logger.Level) logger.FieldLogger {
    l := logrus.New()
    l.Level = lvl
    l.SetFormatter(&logrus.JSONFormatter{})
    l.SetOutput(os.Stdout)
    return logger.Logrus{FieldLogger: l}
}

//... 

app = buffalo.New(buffalo.Options{
// ...
    Logger:       JSONLogger(logger.DebugLevel),
}