Create A Task List Item In SharePoint Using JSOM

Steps

1. Open your SharePoint site.
2. Edit SharePoint page and add a Content Editor WebPart.
3. Add a JavaScript code given below in to CEWP.
4. Save the page and hit F5.

Code snippet

$(document).ready(function
{
CreateTaskList();
});

function CreateTaskList() {

    var clientContext = new SP.ClientContext(https://gowtham.sharepoint.com/tutorials");

var web = clientContext.get_web();

var listInfo = new SP.ListCreationInformation();
listInfo.set_title('Tasks List');
listInfo.set_description('Task List created by JSOM');
listInfo.set_templateType(SP.ListTemplateType.tasksWithTimelineAndHierarchy);
listInfo.set_templateFeatureId('B9CE21G7-A437-4A7E-8BC6-946378C850A');
var list = web.get_lists().add(listInfo);



    }

function onQuerySucceeded() {

    alert('List created sucessfully: ' + oListItem.get_id());
}

function onQueryFailed(sender, args) {

    alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}