How do I parse JSON in golang?

Question

I tried to "Unmarshal" json in golang, but it doesn't seem to be working. I get 0 printed out instead of 1. What am I doing wrong?

package main

import (
  "fmt"
  "encoding/json"
)

type MyTypeA struct {
  a int
}

func main() {
  var smthng MyTypeA
  jsonByteArray := []byte(`{"a": 1}`)
  json.Unmarshal(jsonByteArray, &smthng)
  fmt.Println(smthng.a)
}

OneOfOne · Accepted Answer · 2014-07-05 05:38:39Z

4

Two problems with your code.

You need to export fields or Marshal won't work, read about it here.
Your package must be called main or func main won't be executed.

http://play.golang.org/p/lJixko1QML

type MyTypeA struct {
    A int
}

func main() {
    var smthng MyTypeA
    jsonByteArray := []byte(`{"a": 1}`)
    json.Unmarshal(jsonByteArray, &smthng)
    fmt.Println(smthng.A)
}

answered Jul 5, 2014 at 5:38

OneOfOne

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1 Comment

Drew LeSueur Over a year ago

oops, the foo was a copy paste error. I fixed it so that doesn't throw people off in the future. Thanks for the answer!!!

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