Go JSON Marshal: Omitting Empty Nested Structs
The json:",omitempty" tag in Go allows you to exclude fields that have empty values from JSON output. However, this behavior does not apply to zero-value structs.
To omit a nested struct if it has any empty fields, you can use a pointer instead of a non-pointer struct. This ensures that the struct is treated as empty if it has not been assigned a non-zero value.
For example, consider the following struct:
type ColorGroup struct { ID int `json:",omitempty"` Name string Colors []string } type Total struct { A *ColorGroup `json:",omitempty"` // Use pointer B string `json:",omitempty"` }
In this case, if group.A is not assigned a non-zero value, it will be treated as empty and omitted from JSON output. This is in contrast to using a non-pointer struct, which would still include the empty group.A in JSON output.
The following playground link demonstrates this behavior: https://play.golang.org/p/3i7rh4e3t3D
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