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Advanced Techniques in Go Programming

Structures and JSON

Explore how to use Go struct tags to control JSON marshaling. Understand the use of omitempty to skip empty fields and the '-' tag value to exclude sensitive data from JSON output, enhancing your UNIX system programming in Go.

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Coding example

Imagine that we have a Go structure that we want to convert into a JSON record without including any empty fields—the next widget illustrates how to perform that task with the use of omitempty:

Go (1.19.0)
// Ignoring empty fields in JSON
type NoEmpty struct {
	Name    string `json:"username"`
	Surname string `json:"surname"`
	Year    int    `json:"creationyear,omitempty"`
}

Lastly, imagine that we have some sensitive data on some of the fields of a Go structure that we do not want to include in the JSON records. We can do ...