Delete SharePoint List Items In Browser Console

This article demonstrates how to delete SharePoint list items in browser console using REST API without writing any code in the SharePoint site. To delete list items just copy paste the code in the console window of the browser and then call the function by passing the List name whose items have to be deleted.

source http://www.c-sharpcorner.com/article/delete-sharepoint-list-items-in-browser-console/