How can I ignore specific fields during JSON marshaling in Go?

Ignore struct fields during JSON marshaling using the dash tag: type User struct { Password string `json:"-"` } excludes Password from JSON output completely. This is essential for sensitive data or internal-only fields. For conditional exclusion based on values, use omitempty: `json:"field,omitempty"` omits zero values. Unexported fields (lowercase) are automatically excluded since json package cannot access them. For complex logic, implement custom MarshalJSON() method on your type: func (u User) MarshalJSON() ([]byte, error) { /* custom logic */ }. Use anonymous struct literals to selectively include fields: json.Marshal(struct{ Name string }{Name: user.Name}). Create separate DTO structs for different contexts needing different field visibility. Embedding with tags controls inherited field behavior. Test marshaling output with our JSON Formatter at jsonconsole.com/json-formatter to verify excluded fields. Proper field exclusion protects sensitive data and controls API surface area in production applications.