Convert url of image into base 64 - javascript

I am recieveing image URL from API, while displaying the image breaks sometime.
For this reason i am planing to get the url from the API and Convert the image into the Base64 format and then display the image.
As of for now i m displaying image from url obtained from the API.
Could anyone assist me on how i can download the image from the url. And then convert it to base 64 format.
API.URL is the url of the image obtained form API.
Tried with many alternatives but without success, now i have decided to convert the url into base 64 before assigning.

All you need to convert a variable to base 64 is use the btoa() javascript native function.
But this will not convert the image but the URL itself.
In order to convert the image itself, you must first load it into a HTML5 canvas element and then use toDataURL() and it will return a base64 representation of the image. see here for more "How to convert image into base64 string using javascript
"
const url = "http://google.com"
const base64url = btoa(url)
console.log(base64url)

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Modifying Images on Webpage with Web Extension

I am currently working on a web extension that goes through all the images in the current webpage and blurs them. I have created a backend API that accepts a base64 encoded string of an image and returns the encoded string for the blurred image. My current issue is that I can't find a way to access all the images on the current webpage and get their base64 encoded string through javascript. How can I do this?
The intended architecture of the extension is as follows: the javascript file reads all the images on the webpage and encodes them into a base64 string, which is passed to the backend API. The API then blurs the image and returns a base64 encoded string of the blurred image. The javascript then decodes the string and replaces the original image with the blurred image.
Any help would be greatly appreciated.
I have tried going through all the image tags in the html of the webpage and fetching their urls, however this does not allow me to get the base64 encoding of the image(s). I would like to write a function that takes in the url to an image and returns the base64 encoding.

How to change byte array taken from json to image [duplicate]

I'm writing a web page in HTML/JavaScript. I'm downloading an image from my backend using AJAX. The image is represented as raw byte array, not an URL, so I can't use the standard <img src="{url}"> approach.
How do I display the mentioned image to the user?
Try putting this HTML snippet into your served document:
<img id="ItemPreview" src="">
Then, on JavaScript side, you can dynamically modify image's src attribute with so-called Data URL.
document.getElementById("ItemPreview").src = "data:image/png;base64," + yourByteArrayAsBase64;
Alternatively, using jQuery:
$('#ItemPreview').attr('src', `data:image/png;base64,${yourByteArrayAsBase64}`);
This assumes that your image is stored in PNG format, which is quite popular. If you use some other image format (e.g. JPEG), modify the MIME type ("image/..." part) in the URL accordingly.
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The original image does not have to be base64 encoded, ultimately I want a encrypted image of the original, but have it still be a valid image I could display in a img tag: <img src="myimage" />.
Preferably using javascript.
To encrypt the image, you would save it as a string (there may be limits there), and then when loading the image into the HTML document, use a decrypt method. Here is a related question. You may also find this library helpful (suggested within an answer).

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this.imageTag.src = 'data:image/jpeg;base64,' + base64EncodedImage;
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Decode base64 image link

I'm converting the page to canvas and then canvas to the image. Function convertCanvasToImage returns image link as base64 encoded link. Looking for a solution to decode it cause I'll need that later and would be easier.
Encoded image starts with data:image/png;base64,longString.
I tried
var decodedData = window.atob(n); and http://www.webtoolkit.info/javascript-base64.html
But it returns chinese characters.
Also, I tried sending the encoded string to the server via ajax and then try with base64_decode. Still, I get odd output.
Any reference or solution how to decode base64 png image and get normal URL of the image? Is it possible for a canvas to return normal URL not encoded?

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