get featured image url

1echo get_the_post_thumbnail_url();

1<?php 
2  // ALL parameters are optional. Not needed if you are on WP LOOP
3  echo get_the_post_thumbnail_url( $the_query->ID, array( 500, 400) ); ?>

1if ( has_post_thumbnail()) {
2   $large_image_url = wp_get_attachment_image_src( get_post_thumbnail_id(), 'large');
3   echo '<a href="' . $large_image_url[0] . '">';
4   the_post_thumbnail('thumbnail');
5   echo '</a>';
6}
7