JSFiddle - React, Tailwind, and code Playground

JavaScript

var url1 = "http://jsfiddle.net/img/logo.png";
var url2 = "http://jsfiddle.net/img3r3r3r3/logor3r3r3r3.png";

function checkURL(url) {
    var img = new Image();
    
    img.onerror = function () {
        return false;
    }

    img.onload = function () {
        return true;
    }

    img.src = url;
}

console.log(checkURL(url1));
console.log(checkURL(url2));