Office 365 SharePoint 2013 Online Retreive The Attachment Files From List Item Using REST API

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

A SharePoint 2013 development environment (app isolation 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 the 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() {
    getattachmentfiles();
});


function getattachmentfiles() {
    $.ajax({
       url: siteUrl+"/_api/web/lists/GetByTitle("+listTitle+")/items(itemid)/AttachmentFiles('file name')/"
        method: GET,
        headers:{
        Authorization: "Bearer " + accessToken
        accept: "application/json;odata=verbose",
            content-type: "application/json;odata=verbose"
            content-length:length of post body},
             success: successHandler(responseData),
        error: errorHandler
       });
}
function successHandler(responseData) {
            var attachments=responseData.d.results;
    alert('Request updated Successfully.');
}

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

Conclusion

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