What is Viper?

Viper is a complete configuration solution for Go applications including 12-Factor apps. It is designedto work within an application, and can handle all types of configuration needsand formats. It supports:

• setting defaults
• reading from JSON, TOML, YAML, HCL, and Java properties config files
• live watching and re-reading of config files (optional)
• reading from environment variables
• reading from remote config systems (etcd or Consul), and watching changes
• reading from command line flags
• reading from buffer
• setting explicit values
  Viper can be thought of as a registry for all of your applicationsconfiguration needs.