如何在一个字段中创建nil值的地图，然后将其封送给json？

Question

I need get json string

{"Error": null }

I can do this using this approach

type OKResponse struct {
    Error *int `json:"Error"`
}

encoded, err := json.Marshal(OKResponse{})
...

How I can get the same result using map? Or it is not possible?

For example something like this

jsonbody := map[string]int{"Error": nil}
encoded, err := json.Marshal(&jsonbody)
...

Answer 1

For this particular case you may use:

jsonbody := map[string]error{"Error": nil}

But for more generalized you may also use:

jsonbody := map[string]interface{}{"Error": nil}

Both approaches will produce:

{"Error":null}