Office 365 SharePoint 2013 Online Update List Item Using REST API

To use the example in this blog, you'll need,

A SharePoint 2013 development environment (app isolation, which is required for On-Premises scenario) Visual Studio 2012 or Visual Studio 2013 with Office Developer Tools for Visual Studio 2012 or Napa (SharePoint Online only).

You'll also need to set full control add-in permissions at the Web scope. Only the users who have sufficient permissions to change list permissions (such as site owners) can run this add-in. 

<script>
var siteUrl = 'http://gowthamr.SharePoint.com';
var listTitle = 'Tutorial List';
var itemid='5';
$(document).ready( function() {
    updatelistItem();
});


function updatelistItem() {
    $.ajax({
       url: siteUrl+"/_api/web/lists/GetByTitle("+listTitle+")/items(itemid)" ,
        method: POST,
        body: { '__metadata': { 'type': 'SP.Data.TestListItem' }, 'Title': 'ListItemUpdated'},
        headers: {
        Authorization: "Bearer " + accessToken
         X-RequestDigest: form digest value
        "IF-MATCH": etag or "*"
        "X-HTTP-Method":"MERGE",
        accept: "application/json;odata=verbose"
        content-type: "application/json;odata=verbose"
        content-length:length of post body
                  }
   });
}
function successHandler() {

    alert('Request updated Successfully.');
}

function errorHandler(xhr, ajaxOptions, thrownError) {
    alert('Request failed: ' + xhr.status + '\n' + thrownError + '\n' + xhr.responseText);
}
</script>

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