Support for json:",omitzero" tag #429
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omitzero was added to the go stdlib encoder/json in go 1.24
and does accept omitempty in the go stdlib encoder/json.
nsd20463
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nsd20463
changed the title
neal
reviewed
Dec 10, 2025
tests/data.go
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| // NOTE: omitzero DOES have effect on non-pointer struct fields. | ||
| SubZ, SubNZ SubStruct `json:",omitzero"` | ||
| SubPZ, SubPNZ *SubStruct `json:",omitzero"` |
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may be worth also testing pointer values set with zero-value struct/string
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sure, why not. done.
(both should marshal to something in order to match stdlib json, and they do)
Without a special case the generated code can look like
if v != nil && v != nil {
or
if v != "" && v != "" {
and that gets flagged by go vet (go 1.25.5)
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While adding more test cases I realized that combining omitempty and omitzero together generated code which didn't pass |
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This also fixes the
X uintptr json:",omitempty"
omitempty applied to a zero-value uintptr is treated as empty by the stdlib json.Marshal, but wasn't by easyjson.