Printing Empty Json as a result [duplicate]

Answer 1

The encoding/json package uses reflection (reflect package) to access fields of structs. You need to export the fields of your struct to make it work (start them with an uppercase letter):

type Book struct {
    Isbn   string
    Title  string
    Author string
    Price  float32
}

And when scanning:

err := rows.Scan(&bk.Isbn, &bk.Title, &bk.Author, &bk.Price)

Quoting from json.Marshal():

Struct values encode as JSON objects. Each exported struct field becomes a member of the object...