Friends, I have this javascript code that works perfectly for me to convert the URL of an image to BASE64, but I have not been able to return the result in JSON or STRING format, when I return it appears [object Promise]

If anyone knows what I'm doing wrong, I'd appreciate your help :(

  const convertImgToBase64URL = (url) => {
  console.log(url)
    return new Promise((resolve, reject) => {
      const img = new Image();
      img.crossOrigin = 'Anonymous';
      img.onload = () => {
          let canvas = document.createElement('CANVAS')
          const ctx = canvas.getContext('2d')
          canvas.height = img.height;
          canvas.width = img.width;
          ctx.drawImage(img, 0, 0);
          const dataURL = canvas.toDataURL();
          canvas = null;
          resolve(dataURL)
      }
      img.src = url;
    })
  }
  //for the demonstration purposes I used proxy server to avoid cross origin error
 
  const image = await convertImgToBase64URL('https://image.shutterstock.com/image-vector/vector-line-icon-hello-wave-260nw-1521867944.jpg')
  console.log(image)

}

getImg64()

const return_data = getImg64().toString()