如何处理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

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}