Thanks kevin. Unfortunately the /convertXLSToJSON location isn't being mapped by the controller. Just to make sure, I renamed the class to "ConvertAction" and tried "/convert", but that isn't working either. I get a 404 on both.

>>>>>>>>>>>

    @RequiresPermissionClass(InsertPermission.class)
    public class ConvertAction extends ApiAction
    {
        @Override
        public Object execute(Object o, BindException errors) throws Exception
        {
            JSONObject full_jo = null;
            Map<String, MultipartFile> files = getFileMap();
            try
            {
                full_jo = new JSONObject();
                ...

>>>>>>>>>>

Sorry I'm new to LabKey and am not exactly sure how these routes are getting set up. If you have any further advice, I would appreciate it.

Cyrus