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Golang: Recursively initialize all nil slices in a given object, so they json.Marshal() as empty array [] instead of null.
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golang-cz/nilslice
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Golang'sjson.Marshal() function has a very unfortunate behavior when encodingnil slices. It renders anull value in JSON instead of an empty array[].
This issue has a couple of open issues (ie.golang/go#27589) but none of the proposed solutions were accepted into the standard library as of Aug 2023.
This lightweight Go package will help you mitigate the issue by recursively initializing allnil slices in a given object using areflect package.
typePayloadstruct {Items []Item`json:"items"`}payload:=&Payload{}b,_:=json.Marshal(payload)fmt.Println(string(b))// {"items": null}b,_=json.Marshal(nilslice.Initialize(payload))fmt.Println(string(b))// {"items": []}
$ go get github.com/golang-cz/nilslice
import"github.com/golang-cz/nilslice"