Send an email using Courier with SparkPost that includes an inline image.

send_sparkpost_inline_images.js

/*
  Required environment variables:
    COURIER_AUTH_TOKEN
    
  This will grab an image and convert it to a base64 encoded string.
  Use `cid:bulbasaur.png` as the image path in the Courier Notification Designer.
*/
require("dotenv").config();
const { CourierClient } = require("@trycourier/courier");
const fs = require("fs");

const main = async () => {
  const courier = CourierClient();
  const imageData = fs.readFileSync("bulbasaur.png", { encoding: "base64" });

  const { messageId } = await courier.send({
    eventId: "BY14E1G7KKMNFAJVYNA1A55WH2F5",
    recipientId: "AYDRIAN10036",
    override: {
      sparkpost: {
        body: {
          content: {
            inline_images: [
              {
                name: "bulbasaur.png",
                type: "image/png",
                data: imageData
              }
            ]
          }
        }
      }
    }
  });
  console.log(messageId);
};

main();