List file sizes of all images on a page (Chrome Extension)

Question

I want to write a Chrome Extension where you enter a page URL and it lists all the image filenames that appear on that page with the file sizes of those images e.g. \"Page c

Answer 1

You can call document.images to get images in document, use fetch(), Response.blob() to return Blob response of image, check .size of Blob, get name of image with URL() constructor

let getImages = () => {
  let images = Array.from(document.images);
  return Promise.all(images.map(img => fetch(img.src)
    .then(response => response.blob())))
    .then(blobs => {
      return blobs.map((img, index) => {
        let name = new URL(images[index].src).pathname.split("/").pop();
        name = !/\./.test(name) 
               ? name + "." + img.type.replace(/.+\/|;.+/g, "") 
               : name;
        return {
          name: name,
          size: img.size
        }
      });
    })
}

getImages()
.then(images => console.log(JSON.stringify(images)))
.catch(e => console.log(e))

<img src="https://placehold.it/10x10">
<img src="https://placehold.it/20x20">