Partial unmarshal for Medium post "Using Go's json.RawMessage"

partial.go

contents := []byte(`
{
	"key": "value",
	"key2": "value2"
}
`)

type Custom struct {
	Key string
	Key2 json.RawMessage
}

customStructure := &Custom{}
err := json.Unmarshal(contents, customStructure)
if err != nil {
	fmt.Println(err)
}