envdecode

envdecode is a Go package for populating structs from environment variables.

envdecode uses struct tags to map environment variables to fields, allowing you you use any names you want for environment variables. envdecode will recurse into nested structs, including pointers to nested structs, but it will not allocate new pointers to structs.

API

Define a struct with env struct tags:

type Config struct {
    Hostname  string `env:"SERVER_HOSTNAME,default=localhost"`
    Port      uint16 `env:"SERVER_PORT,default=8080"`

    AWS struct {
        ID     string `env:"AWS_ACCESS_KEY_ID"`
        Secret string `env:"AWS_SECRET_ACCESS_KEY,required"`
    }
}

• Fields must be exported (i.e. begin with a capital letter) in order for envdecode to work with them.

Then call envdecode.Decode:

var cfg Config
err := envdecode.Decode(&cfg)