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Rename images before inserting it in Rich Text Editor in JavaScript RichTextEditor control

By using the insertImageSettings property, you can specify the server handler to upload the selected images. Then you can bind the imageUploadSuccess event, to receive the modified file name from the server and update it in the Rich Text Editor’s insert image dialog.

<div id='defaultRTE'>
    <p>The Rich Text Editor is WYSIWYG ("what you see is what you get") editor useful to create and edit content, and return the valid <a href="https://ej2.syncfusion.com/home/" target="_blank">HTML markup</a> or <a href="https://ej2.syncfusion.com/home/" target="_blank">markdown</a> of the content</p>
    <p><b>Key features:</b></p>
    <ul>
        <li>
            <p>Provides &lt;IFRAME&gt; and &lt;DIV&gt; modes</p>
        </li>
        <li>
            <p>Capable of handling markdown editing.</p>
        </li>
        <li>
            <p>Contains a modular library to load the necessary functionality on demand.</p>
        </li>
    </ul>
</div>
import { RichTextEditor, Toolbar, Link, Image, Count, HtmlEditor, QuickToolbar } from '@syncfusion/ej2-richtexteditor';
RichTextEditor.Inject(Toolbar, Link, Image, Count, HtmlEditor, QuickToolbar);

let defaultRTE: RichTextEditor = new RichTextEditor({
        toolbarSettings: {
            items: ['Bold', 'Italic', 'Underline', 'StrikeThrough','|',
                'FontName', 'FontSize', 'FontColor', 'BackgroundColor',
                'LowerCase', 'UpperCase', '|',
                'Formats', 'Alignments', 'OrderedList', 'UnorderedList',
                'Outdent', 'Indent', '|',
                'CreateLink', 'Image', '|', 'ClearFormat', 'Print',
                'SourceCode', 'FullScreen', '|', 'Undo', 'Redo']
        },
        insertImageSettings: {
            saveUrl: "[SERVICE_HOSTED_PATH]/api/uploadbox/Rename",
            path: "../Images/"
        },
        imageUploadSuccess: onImageUploadSuccess
    });
defaultRTE.appendTo('#defaultRTE');

function onImageUploadSuccess (args: any) {
    alert("Get the new file name here");
    if (args.e.currentTarget.getResponseHeader('name') != null) {
        args.file.name = args.e.currentTarget.getResponseHeader('name');
        let filename: any = document.querySelectorAll(".e-file-name")[0];
        filename.innerHTML = args.file.name.replace(document.querySelectorAll(".e-file-type")[0].innerHTML, '');
        filename.title = args.file.name;
    }
}

To configure server-side handler, refer the below code.

int x = 0;
string file;
[AcceptVerbs("Post")]
public void Rename()
{
    try
    {
        var httpPostedFile = System.Web.HttpContext.Current.Request.Files["UploadFiles"];
        imageFile = httpPostedFile.FileName;
        if (httpPostedFile != null)
        {
            var fileSave = System.Web.HttpContext.Current.Server.MapPath("~/Images");
            if (!Directory.Exists(fileSave))
            {
                Directory.CreateDirectory(fileSave);
            }
            var fileName = Path.GetFileName(httpPostedFile.FileName);
            var fileSavePath = Path.Combine(fileSave, fileName);
            while (System.IO.File.Exists(fileSavePath))
            {
                imageFile = "rteImage" + x + "-" + fileName;
                fileSavePath = Path.Combine(fileSave, imageFile);
                x++;
            }
            if (!System.IO.File.Exists(fileSavePath))
            {
                httpPostedFile.SaveAs(fileSavePath);
                HttpResponse Response = System.Web.HttpContext.Current.Response;
                Response.Clear();
                Response.Headers.Add("name", imageFile);
                Response.ContentType = "application/json; charset=utf-8";
                Response.StatusDescription = "File uploaded succesfully";
                Response.End();
            }
        }
    }
    catch (Exception e)
    {
        HttpResponse Response = System.Web.HttpContext.Current.Response;
        Response.Clear();
        Response.ContentType = "application/json; charset=utf-8";
        Response.StatusCode = 204;
        Response.Status = "204 No Content";
        Response.StatusDescription = e.Message;
        Response.End();
    }
}