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viper.AutomaticEnv()

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err := viper.WriteConfigAs("path/to/ConfigFile.yaml")
if err != nil {
	return nil, err
}

err := viper.SafeWriteConfig("path/to/ConfigFile.yaml")
if err != nil {
	return nil, err
}

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err := viper.WriteConfig()
if err != nil {
	return nil, err
}

err := viper.SafeWriteConfig()
if err != nil {
	return nil, err
}

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viper.OnConfigChange(func(e fsnotify.Event) {
  // do something whenever a configguration changes
})

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viper.WatchConfig()

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allSettings := viper.AllSettings()
allKeys := viper.AllKeys()

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if(viper.IsSet("key")) {
// do something
}

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string := viper.GetString("key")
int := viper.GetInt("int")
bool := viper.GetBool("key")
duration := viper.GetDuration("key")
stringMap := viper.GetStringMap("key")

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viper.SetDefault("logs", true)
viper.SetDefault("port", 8080)
viper.SetDefault("db", "mongodb://localhost:27017")

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err := viper.ReadInConfig()
if err != nil {
  panic(fmt.Errorf("Fatal error config file: %w \n", err))
}