Validation turns untrusted configuration input into data the application can safely use. In Go, parsing with encoding/json checks JSON structure and Go types while returning errors for malformed input; custom unmarshaling adds domain-specific rules such as URL validation. section 10.5.1
Configuration validation
A configuration containing name, version, debug, port, and host fields can be decoded into Config. Unmarshal rejects malformed JSON or incompatible types; custom unmarshaling then checks that host is a valid URL. A separately parsed port must fall between 1 and 65535, while debug accepts the Boolean forms supported by strconv.ParseBool.
