- [log](utils/log): Golang log library base [logrus](https://github.com/sirupsen/logrus) and [logrus-prefixed-formatter](https://github.com/x-cray/logrus-prefixed-formatter)
- [jwt](utils/jwt): This is a simple tool to sign, verify and show JSON Web Tokens ([JWT](http://jwt.io/)) from the command line, base [jwt-go](https://github.com/dgrijalva/jwt-go).
- [ip](utils/ip): Obtain public IP, check the intranet IP, detect IP type, check IP range, IP address string and int transformation, according to ip to determine the region and operators, etc