json.Marshal vs JSON.stringify

	Go json.Marshal	JS JSON.stringify
Returns	([]byte, error)	string
Error handling	Second return value	Throws exception
Field visibility	Exported fields only (capitalized)	All enumerable properties
Field naming	Struct tags (json:"name")	Property names as-is

Go-specific behaviour

Only exported (capitalized) fields are marshaled:

type Example struct {
    Name string  // ✅ marshaled
    age  int     // ❌ ignored
}

Control JSON output with struct tags:

type User struct {
    Name string `json:"name"`
    Age  int    `json:"age,omitempty"`  // omit if zero
}