Struct for JSON objects in GO [duplicate]

Question

I'm learning GO and when defining structs for working with JSON like below.

type List struct {
    ID   string `datastore:"-"`
    Name string
}

I see that there is this text in between ` sign. I have not been able to find an explanation what that signifies.

Things seem to work even without those.

Answer 1

They are struct tags used in Marshal'ing Go struct into JSON. In JSON, unlike Go, fields are in lowercase strings. Therefore, most use cases would be

type List struct {
    ID   string `json:"id"`
    Name string `json:"name"`
}

In JSON

{
  "id": "some id",
  "name": "some name"
}

See post here