Use JavaScript to upload anonymously to Imgur using Imgur API and show the link to the file. Make sure your API key is valid and working!

web-snippet-055 ( upload to Imgur in JavaScript)

function upload(file) {
    
    var imageLink ="";

    /* Is the file an image? */
    if (!file || !file.type.match(/image.*/)) return;

    var fd = new FormData();
    fd.append("image", file); // Append the file
    fd.append("key", "<Imgur API key>");

    var xhr = new XMLHttpRequest();
    xhr.open("POST", "http://api.imgur.com/2/upload.json");
    xhr.onload = function() {
        var link = JSON.parse(xhr.responseText).upload.links.imgur_page;

        document.querySelector("#link").href = link;
        document.querySelector("#link").innerHTML = link;
        var imageLink = ""+document.querySelector("#link").innerHTML.replace("http://imgur.com/", "http://i.imgur.com/")+".jpg";

        /* Image Preview */
        document.getElementById("result").style.display = "inline";
        document.getElementById("link-to-image").style.background = "url(" + imageLink + ") center center no-repeat";
    };

    /* Send the formdata */
    xhr.send(fd);
};

Slightly longer version, which uses clipboard interaction to upload to imgur v3 API https://gist.github.com/Lewiscowles1986/6cac3472336a1cf009a88bde56a65fe3