Having issues creating a struct for this JSON - json

Question

I am very, very new to golang (using this project as a way to learn the language better). I have an api I'd like to pull data from, but I can't seem to create the right type of struct for it.
The full JSON I am trying to encode is located here. https://prices.runescape.wiki/api/v1/osrs/latest
The structure of the JSON is
{
"data": {
"2": {
"high": 182,
"highTime": 1621811749,
"low": 180,
"lowTime": 1621811755
},
"6": {
"high": 186683,
"highTime": 1621811083,
"low": 184528,
"lowTime": 1621811286
},
... REPEATS THOUSANDS OF TIMES ...
}
}
I have tried using the JSON to Go converter for the JSON data, but that returns a struct that is entirely too large. (Go returns an error) I have tried to manually make a struct with a slice as follows
type osrsPrices []struct {
ID struct {
High int `json:"high"`
Hightime int `json:"highTime"`
Low int `json:"low"`
Lowtime int `json:"lowTime"`
} `json:"id"`
}
Whenever I try to run this from the terminal I am presented with the error "json: cannot unmarshal object into Go value of type main.osrsPrices exit status 1"
Here is the entire code I am using
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"time"
)
type osrsPrices []struct {
ID struct {
High int `json:"high"`
Hightime int `json:"highTime"`
Low int `json:"low"`
Lowtime int `json:"lowTime"`
} `json:"id"`
}
func main() {
url := "https://prices.runescape.wiki/api/v1/osrs/latest"
spaceClient := http.Client{
Timeout: time.Second * 2, // Timeout after 2 seconds
}
req, err := http.NewRequest(http.MethodGet, url, nil)
if err != nil {
log.Fatal(err)
}
req.Header.Set("User-Agent", "skillerscape:LearningGoLang|priceChecker")
res, getErr := spaceClient.Do(req)
if getErr != nil {
log.Fatal(getErr)
}
if res.Body != nil {
defer res.Body.Close()
}
body, readErr := ioutil.ReadAll(res.Body)
if readErr != nil {
log.Fatal(readErr)
}
items := osrsPrices{}
jsonErr := json.Unmarshal(body, &items)
if jsonErr != nil {
log.Fatal(jsonErr)
}
for _, item := range items {
fmt.Println(item)
}
}
I am pretty sure the error has to do with the way I am trying to process the data, but I cannot figure out the issue directly, nor the solution despite a couple hours of googling. I appreciate any help anyone has on this issue.

Answer 1

At the deepest level, you have:
type Price struct {
High int `json:"high"`
Hightime int `json:"highTime"`
Low int `json:"low"`
Lowtime int `json:"lowTime"`
}
This is in an object with variable keys, so you need:
type Data struct {
Data map[string]Price `json:"data"`
}
Then you can unmarshal into an instance of this struct:
var data Data
json.Unmarshal(input,&data)