Package log is a simple and configurable Logging in Go, with level, formatters and writers. It is completely API compatible with the standard library logger. The simplest way to use log is simply the package-level exported logger: package main Output: You also can config `log.Default` or new `log.Logger` to customize formatter and writer. Output log in `/tmp/test.log`: For a full guide visit https://github.com/subchen/go-log