Golang JSON Array - go

Question

I am trying to use WordNik () to get random words for the dictionary for this script: https://github.com/jmagrippis/password
WordNik is outputting:
[{"id":7936915,"word":"Tanganyikan"},{"id":27180,"word":"cartographic"},{"id":48094,"word":"deterministic"},{"id":1485119,"word":"higher-risk"},{"id":120986,"word":"juristic"},{"id":1830806,"word":"magnetorheological"},{"id":320495,"word":"quelled"},{"id":324610,"word":"remoter"},{"id":215158,"word":"telemetric"},{"id":225207,"word":"uninquisitive"}]
Here is my code:
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"time"
"github.com/jmagrippis/password"
)
type Words struct {
id []int64
word []string
}
type GetWordsResponse struct {
WordList []Words
}
func getWords(speech string) (*GetWordsResponse, error) {
url := fmt.Sprintf("http://api.wordnik.com/v4/words.json/randomWords?hasDictionaryDef=false&includePartOfSpeech=%s&minCorpusCount=0&maxCorpusCount=-1&minDictionaryCount=1&maxDictionaryCount=-1&minLength=5&maxLength=-1&limit=10&api_key=api_key", speech)
res, err := http.Get(url)
if err != nil {
panic(err.Error())
}
body, err := ioutil.ReadAll(res.Body)
if err != nil {
panic(err.Error())
}
var s = new(GetWordsResponse)
var arr []string
_ = json.Unmarshal([]byte(body), &arr)
log.Printf("Unmarshaled: %v", arr)
return s, err
}
func main() {
dictionary := &password.Dictionary{
Adjectives: []string{"beautiful", "homely", "magical", "posh", "excellent"},
Subjects: []string{"mermaids", "unicorns", "lions", "piranhas"},
Verbs: []string{"love", "fancy", "eat", "bring", "fear", "aggravate"},
Adverbs: []string{"cuddling", "slapping", "shouting", "jumping"},
Objects: []string{"teddy-bears", "diamonds", "buckets", "boxes"},
}
generator := password.NewGenerator(dictionary, time.Now().UnixNano())
pass := generator.Generate()
fmt.Printf("%s", pass)
getWords("Verb")
}
As you can see, what I am trying to do is use WordNik API to request Adverbs, nouns, etc and then make a dictionary based off those words to generate a password. I am horrible with arrays and handling data.

Answer 1

As pointed out in the comments you need to export the fields so they can be unmarshaled
The encoding/json package relies on reflection and since it is in another package, it cannot access unexported fields. ( in go, fields, methods or functions that start with a small letter are unexported whereas with capital letters they are exported )
Then your example json does not contain the WordList at all, so what you want is unmarshaling directly into the array of Words. Also a words object only consists of Id and Word and not of arrays themselves.
type Words struct {
Id int64
Word string
}
func main() {
....
var words []Words
// you don't need to read the whole body first, you can decode in the same turn like this
err := json.NewDecoder(req.Body).Decode(&words)
if nil != err {
log.Fatal(err)
}
...
}
Another very important thing is that you should not ignore errors. This would have helped you to debug the issue. ( What I mean is _ = json.Unmarshal)
As for beginning with go, you could implement a simple test to see if your code works as intended.
https://play.golang.org/p/nuz9uXdka5S < check this working example for reference.