如何将JSON解析为数据结构

Question

I am trying to parse a JSON of the type

"{\"ids\":[\"a\",\"b\"]}"

Here is my code:

package main

import "fmt"
import "encoding/json"
import "strings"

type Idlist struct {
    id []string `json:"ids"`
}
func main() {
    var val []byte = []byte(`"{\"ids\":[\"a\",\"b\"]}"`)
    jsonBody, _ := strconv.Unquote(string(val))

    var holder Idlist
    if err := json.NewDecoder(strings.NewReader(jsonBody)).Decode(&holder); err!= nil{
        fmt.Print(err)
    }
    fmt.Print(holder)
    fmt.Print(holder.id)
}

However, I keep getting output

{[]}[]

I cannot get the data in the structure. Where am I going wrong? Here is the playground link: https://play.golang.org/p/82BaUlfrua

Answer 1

Your struct has to look like :

type Idlist struct {
    Id []string `json:"ids"`
}

Golang assumes that the fields starting with capital case are public. Hence, your fields are not visible to json decoder. For more details please look into this post : Why Golang cannot generate json from struct with front lowercase character?