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Converting HTML/CSS to an Image with Go


This code only uses the standard library, so the only prerequisite is that you have go installed.

Example code

This code sample creates our request body, formats it, creates a new POST request, sets our authentication, creates a client, performs the POST to the API, reads the response and then prints it out the response as a string. The response will be json with the URL to the generated image.

{% code-tabs %} {% code-tabs-item title="main.go" %}

package main
import (
const (
    userID = "your_user_id"
    apiKey = "your_api_key"
func main() {
    data := map[string]string{
        "html": "<div class='ping'>Pong ✅</div>",
        "css":  ".ping { padding: 20px; font-family: 'sans-serif'; }",
    reqBody, err := json.Marshal(data)
    if err != nil {
        log.Fatalf("unable to marshal data: %s", err.Error())
    req, err := http.NewRequest("POST", "", bytes.NewReader(reqBody))
    if err != nil {
        log.Fatalf("unable to create new request: %s", err.Error())
    req.SetBasicAuth(userID, apiKey)
    client := &http.Client{Timeout: time.Second * 10}
    resp, err := client.Do(req)
    if err != nil {
        log.Fatalf("request was unsuccessful: %s", err.Error())
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        log.Fatalf("unable to read response body: %s", err.Error())

    // {"url":""}

{% endcode-tabs-item %} {% endcode-tabs %}

More examples

For more advanced examples, take a look here.

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