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I want to automatically populate the value of a people picker field with the currently logged on user in a SharePoint list item. 
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I want to automatically populate the value of a people picker field with the currently logged on user in a SharePoint list item. 

Using javascript to populate people/group field on SharePoint list with currently logged on user

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

Microsoft Sharepoint is a software platform and family of software products used for collaboration and web publishing combined. These capabilities include developing web sites, portals, intranets, content management systems, search engines, wikis, blogs, and other tools for business intelligence and collaboration. SharePoint has a Microsoft Office-like interface, and it is closely integrated with the Office suite.