How Do I Disable Logging in Go?

Disabling Loggers in Go

You're working with code heavily instrumented with Go's logging package. When it's time to turn off logging, you're baffled by the absence of a discernible method to disable the standard logger. Should you set a flag before making log calls or resort to commenting them out in production?

Fear not, there's a solution that avoids the creation of custom io.Writer types and manual flag checking.

Solution

Use io/ioutil.Discard to write to a nothingness io.Writer:

import (
    "log"
    "io/ioutil"
)

func init() {
    log.SetOutput(ioutil.Discard)
}

For Go 1.16 and above, simply use io.Discard:

log.SetOutput(io.Discard)

This effectively disables logging by discarding all log entries. No more arduous flag checking or manual commenting required!

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