---
title: "Go"
description: "Generate images with the Imejis.io API in Go using net/http. A tested example that POSTs dynamic field overrides to a design and saves the rendered image."
url: "https://www.imejis.io/apis/go"
published: "2026-07-25"
---

# Go

## Go

Generate an image from a template with a single POST request, using only the Go standard library. Imejis returns the finished image directly, so there are no webhooks and nothing to poll.

Set two environment variables first: `IMEJIS_API_KEY` (from your dashboard) and `IMEJIS_DESIGN_ID` (any design's ID). Then send the fields you want to change as `component.property` pairs, for example `headline.text`.

```go showLineNumbers title="Go (net/http)"
package main

import (
	"bytes"
	"fmt"
	"io"
	"net/http"
	"os"
)

func main() {
	designID := os.Getenv("IMEJIS_DESIGN_ID")
	apiKey := os.Getenv("IMEJIS_API_KEY")
	body := []byte(`{"headline.text":"Hello from Go"}`)

	req, _ := http.NewRequest("POST", "https://render.imejis.io/v1/"+designID, bytes.NewBuffer(body))
	req.Header.Set("dma-api-key", apiKey)
	req.Header.Set("Content-Type", "application/json")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	image, _ := io.ReadAll(res.Body)
	os.WriteFile("output.jpg", image, 0644)
	fmt.Println("status", res.StatusCode, "bytes", len(image))
}
```

**Override any field.** Each dynamic component exposes keys like `headline.text`, `title.color`, or `image.image`. Send only the ones you want to change. You can find a design's overridable fields in its Share / API panel.

The response is the raw image (`image/jpeg` by default). Save it to disk, stream it, or return it straight from your own endpoint.