Get Poets list from Wordpress json-api

function listPoets(data) {
    var output='';
    var val = '';
    $.each(data.posts,function(key,val) {
        console.log(val.thumbnail);
        output += '<div data-role="collapsible">';
        output += '<h3>' + val.title + '</h3>';
        if (val.thumbnail !== 'undefined') {
        output += '<img src="' + val.thumbnail + '" alt="' + val.title + '"/>';
        } else {
        output += '<img src="images/WSLogo.jpg" alt="Word Salad Logo"/>';
        }
        output += val.content;
        output += '</div>';
    }); // go through each post
    $('#poetslist').html( $(output) );
} // lists all the poems