Go JSON with simplejson

go, json

Solution

You have a few mistakes:

- If you'll check the JSON response you'll notice that `total` field is not string, that's why you should use `MustInt()` method, not `String()`, when you are accessing the field.

- `Printf()` method invocation was totally wrong. You should pass a "template", and then pass arguments appropriate to the number of "placeholders".

By the way, I strongly recomend you to check `err != nil` everywhere, that'll help you a lot.

Here is the working example:

package main

import (
    "fmt"
    "github.com/bitly/go-simplejson"
    "io/ioutil"
    "log"
    "net/http"
)

func main() {
    url := "http://api.stackoverflow.com/1.1/tags?pagesize=100&page=1"
    res, err := http.Get(url)
    if err != nil {
        log.Fatalln(err)
    }

    body, err := ioutil.ReadAll(res.Body)
    if err != nil {
        log.Fatalln(err)
    }

    // fmt.Printf("%s\n", string(body))

    js, err := simplejson.NewJson(body)
    if err != nil {
        log.Fatalln(err)
    }

    total := js.Get("total").MustInt()
    if err != nil {
        log.Fatalln(err)
    }

    fmt.Printf("Total:%s", total)
}

Problem

Original source