Starting with Go 1.24, support for omitzero was added, so it can now be enabled as an option.

Add enable_model_json_omitzero_tag flag. Currently, the enable_model_json_omitzero_tag default is false for backward compatibility. However, the json v2 package recommends using omitzero instead of omitempty. The specification for omitempty changed significantly in v2, so migrating to omitzero seems reasonable.

In the future, when gqlgen supports the json v2 package, change the default of enable_model_json_omitzero_tag to true and the default of enable_model_json_omitempty_tag to false.

• omitzero

enable_model_json_omitempty_tag: false
enable_model_json_omitzero_tag: true

type OmitEmptyJSONTagTest struct {
	ValueNonNil string  `json:"ValueNonNil" database:"OmitEmptyJsonTagTestValueNonNil"`
	Value       *string `json:"Value,omitzero" database:"OmitEmptyJsonTagTestValue"`
}

• omitzero and omitempty

enable_model_json_omitempty_tag: true # or not set
enable_model_json_omitzero_tag: true

type OmitEmptyJSONTagTest struct {
	ValueNonNil string  `json:"ValueNonNil" database:"OmitEmptyJsonTagTestValueNonNil"`
	Value       *string `json:"Value,omitempty,omitzero" database:"OmitEmptyJsonTagTestValue"`
}

• Added tests covering the bug / feature (see testing)
• Updated any relevant documentation (see docs)