I have successfully embedded javascipt with jQuery into a page in SharePoint and I am trying to write a function that, when called on load, obtains the data from an excel file that has been uploaded into the SharePoint's library, so that I can manipulate it with JavaScript and push it into a SharePoint List. My issues are coming from that first part. I have attempted to do this with the following code, which was obtained from SharePoint's documentation and modified to use the ".fail" function instead of the deprecated ".error" function:

function readFile() {
    var clientContext;
    var oWebsite;
    var fileUrl;

    clientContext = new SP.ClientContext.get_current();
    oWebsite = clientContext.get_web();

    clientContext.executeQueryAsync(function () {
        fileUrl = "My file's url as obtained from SharePoint";

            url: fileUrl,
            type: "GET"
            .done(Function.createDelegate(this, successHandler))
            .fail(Function.createDelegate(this, errorHandler));
    }, errorHandler);

    function successHandler(data) {

    function errorHandler() {
        console.log("Request failed: " + arguments[2]);

This appears to work, as I receive no errors and the data is indeed displayed in the console. However, instead of the file's contents, I see this:

<!DOCTYPE html>
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name='viewport' content='width=device-width, initial-scale=1' />
    <meta name='robots' content='noindex' />
    <link rel="shortcut icon" href="http://spoos-16-rdn.bankofamerica.com/wv/resources/1033/FavIcon_Word.ico" />

    <script type="text/javascript">
       var WOPIPerf_UserClick = null;
       if (window.sessionStorage)
           WOPIPerf_UserClick = window.sessionStorage.getItem("WOPIPerf_UserClickTime");

    <script type="text/javascript">
function ULS6zp(){var o=new Object;o.ULSTeamName="Microsoft SharePoint Foundation";o.ULSFileName="WOPIFrame.aspx";return o;}
        function getWopiIFrameElement()
            return document.querySelector("iframe[name=WebApplicationFrame]");
        function WACRedirector()
            var myFrame = getWopiIFrameElement();
            myFrame.id = "WebAp

I'm not sure what's going on, but I feel like there's a step missing here. When I enter the url into my browser, it redirects to SharePoint's in-house document editor, where I can indeed see the document's contents and even edit it. Is there something else I need to do to obtain the file's actual content in JavaScript?

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