How to process JSON - json

Question

I'm building a web server with Go and I don't know how to process JSON with Go.
Saying that I have a struct as below:
type User struct{
Id int
Name string
Password string
Status int
}
and now I have had an object of the struct User:
user := User{1, "Test", "password", 1}
Now I need to convert user to a JSON object. Here is what I've found:
b, err := json.Marshal(user)
fmt.Println(string(b))
It works well.
Now I want to do two things:
1) remove the Password from the JSON object
2) add a new filed: "code": 200 into the JSON object
What should I do?

Answer 1

If you want to keep the Password property accessible to outer packages, you can set a tag: json:"-" on it. As specified in the docs:
The encoding of each struct field can be customized by the format
string stored under the "json" key in the struct field's tag. The
format string gives the name of the field, possibly followed by a
comma-separated list of options. The name may be empty in order to
specify options without overriding the default field name.
The "omitempty" option specifies that the field should be omitted from
the encoding if the field has an empty value, defined as false, 0, a
nil pointer, a nil interface value, and any empty array, slice, map,
or string.
As a special case, if the field tag is "-", the field is always
omitted. Note that a field with name "-" can still be generated using
the tag "-,".
type User struct {
Id int
Name string
Password string `json:"-"`
Status int
Code int `json:"code"`
}

Answer 2

make Password lower case (and add Code int to your struct):
Try this:
package main
import (
"encoding/json"
"fmt"
)
func main() {
user := User{1, "Test", "password", 1, 200}
b, err := json.Marshal(user)
if err != nil {
panic(err)
}
fmt.Println(string(b))
}
type User struct {
Id int
Name string
password string
Status int
Code int
}
output:
{"Id":1,"Name":"Test","Status":1,"Code":200}