Convert HTML to Image in Go

package main

import (
    "bytes"
    "encoding/json"
    "io"
    "net/http"
    "os"
)

func htmlToImage(html string) ([]byte, error) {
    body, _ := json.Marshal(map[string]any{
        "html":   html,
        "width":  800,
        "height": 400,
        "format": "png",
    })
    req, _ := http.NewRequest("POST",
        "https://renderpix.dev/v1/render",
        bytes.NewReader(body))
    req.Header.Set("X-API-Key", "rpx_your_key")
    req.Header.Set("Content-Type", "application/json")
    res, err := http.DefaultClient.Do(req)
    if err != nil { return nil, err }
    defer res.Body.Close()
    return io.ReadAll(res.Body)
}

func main() {
    img, _ := htmlToImage(`<div style="padding:40px;background:#0f172a;color:white">Hello!</div>`)
    os.WriteFile("out.png", img, 0644)
}