Golang Reflection: Get Tag from struct field

Question

Is it possible to reflect on a field of a struct, and get a reference to its tag values?

For example:

type User struct {
    name    string `json:name-fi         


        

Answer 1

You don't need to pass in the whole struct, but passing in the value of one of the fields is not sufficient.

In your example user.name field is just a string - the reflect package will have no way of correlating that back to the original struct.

Instead, you need to pass around the reflect.StructField for the given field:

field, ok := reflect.TypeOf(user).Elem().FieldByName("name")
…
tag = string(field.Tag)

Note: we use Elem above because user is a pointer to a struct.

You can play with an example here.