How make viper recognise the json in my envvar?

  Kiến thức lập trình

I’m trying to override AllInputChannels with an envvar. The main config is in config.yaml which is picked up fine.

Running the below code viper.Unmarshal() throws an error:

'AllInputChannels' expected a map, got 'string'

How should I present the value in the envvar so it’s recognised?

I’ve removed error checking code below for clarity, except where the error appears.

type ChannelMap struct {
    Team    string `mapstructure:"Team"`
    Channel string `mapstructure:"Channel"`

type AllInputChannels struct {
    Production []ChannelMap `mapstructure:"Production"`
    Staging    []ChannelMap `mapstructure:"Staging"`

type Config struct {
    AllInputChannels AllInputChannels `mapstructure:"AllInputChannels"`

func NewConfig() Config { return Config{} }

func Build() Config {
    conf := NewConfig()
    _ = os.Setenv("ALLINPUTCHANNELS", `{"staging":[{"team":"Foo","channel":"DEF456"}]}`)

    viper.AddConfigPath(".") // Local builds.

    _ = viper.BindEnv("AllInputChannels")

    _ = viper.ReadInConfig()

    err := viper.Unmarshal(&conf)
    if err != nil {
        fmt.Printf("unable to decode config, %v", err)

    return conf, nil

func main() {
    _ = Build()

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