How can I get the json I need?

Question

go

The whole example is here - https://github.com/Delgus/go-postgres-example
The main script is here - https://github.com/Delgus/go-postgres-example/blob...
In general, in main.go the following The code
json.NewEncoder(w).Encode(bks)
returns an unexpected result for me.
I expected to see

[
{
"isbn":"978-1503261969",
"title":"Emma",
"author":"Jayne Austen",
"price":9.44
},....]

I see

[
{"isbn":"978-1503261969",
"title":{"String":"Emma","Valid":true},
"author":{"String":"Jayne Austen","Valid":true},
"price":{"Float64":9.44,"Valid":true}},
......]

How do I get the json in the first option?