GO Lang decode JSON (simple array not being picked up)

Question

Structs and JSON are not super fun in Go.

I have a simple example of some JSON, and a struct. Everything seems to get parsed Okay, but for some reason the array does not get picked up.

Can anyone tell me what I might be missing.

Code--- package main

import ( "encoding/base64" "fmt" "encoding/json" ) type Oauth struct { Aud string `json:"aud"` Cid string `json:"cid"` Exp int `json:"exp"` Iat int `json:"iat"` Iss string `json:"iss"` Jti string `json:"jti"` Scp []string `json:"scp"` Sub string `json:"sub"` UID string `json:"uid"` Ver int `json:"ver"` } func main () { // This is the String {"ver":1,"jti":"AT.zgv9oQpw-7l3BCg6Xb5NCG2Pf8zxgiQa1EUBXycmaDk","iss":"https://companyx.okta.com/oauth2/aus1a4ibdat0JYw5s1d8","aud":"http://localhost","iat":1484538606,"exp":1484542206,"cid":"3jmNvVCFZ5F6lWOzIONO","uid":"00uy74c0h7NGTLBSXQOC","scp":["read","remove","reserve"],"sub":"[email protected]"} encoded := "eyJ2ZXIiOjEsImp0aSI6IkFULnpndjlvUXB3LTdsM0JDZzZYYjVOQ0cyUGY4enhnaVFhMUVVQlh5Y21hRGsiLCJpc3MiOiJodHRwczovL2NvbXBhbnl4Lm9rdGEuY29tL29hdXRoMi9hdXMxYTRpYmRhdDBKWXc1czFkOCIsImF1ZCI6Imh0dHA6Ly9sb2NhbGhvc3QiLCJpYXQiOjE0ODQ1Mzg2MDYsImV4cCI6MTQ4NDU0MjIwNiwiY2lkIjoiM2ptTnZWQ0ZaNUY2bFdPeklPTk8iLCJ1aWQiOiIwMHV5NzRjMGg3TkdUTEJTWFFPQyIsInNjcCI6WyJyZWFkIiwicmVtb3ZlIiwicmVzZXJ2ZSJdLCJzdWIiOiJva3RhYWRtaW5Ab2t0YS5jb20ifQ" data, _ := base64.StdEncoding.DecodeString(encoded) fmt.Println(string(data)) fmt.Println ("") var x Oauth json.Unmarshal([]byte(data), &x) fmt.Printf ("%+v",x.Scp); }

The result is always an Empty Array []

I put the code on GoLang Playground to make it easier to see what I'm seeing: play.golang.org/p/Pebw7UgGRC — user3888307
– user3888307, Commented Jan 16, 2017 at 4:39

Kaedys · Accepted Answer · 2017-01-16 17:07:43Z

The encoded string isn't a valid JSON, easy to detect because you're ignoring an important error on Unmarshal, try this:

err := json.Unmarshal(data, &x) fmt.Println(err)

It looks like you missed the last '}' of your JSON.

Alex Pliutau · Accepted Answer · 2017-01-16 04:49:55Z

0

Your base64-encoded string is not valid:

illegal base64 data at input byte 404

answered Jan 16, 2017 at 4:49

Alex Pliutau

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