If you need to fetch a list of articles from your wordpress site to show them in another web application then you can use the new JSON API in wordpress to do this.

//	get post list
$wp_url = 'https://www.yourdomain.co.uk/wp-json/wp/v2/posts?categories=4&_embed';
$wp_json = file_get_contents($wp_url);
$wpposts = json_decode($wp_json, TRUE);

Replace the 4 with the category ID you would like to fetch.

You can then loop through $wpposts to show the posts on your website.

An example of this would be

<?php if(isset($wpposts) && is_array($wpposts))  : ?>

<div class="wp-posts pure-g">
	
	<?php foreach($wpposts as $wppost) : ?>

	<div class="pure-u-1-2 pure-u-md-1-3">
		<a href="news?<?php echo $wppost['id']; ?>">
		<div class="wp-post">
			<div class="wp-post-image">
				<?php if( isset($wppost['_embedded']['wp:featuredmedia'][0]['source_url'])) : ?>
				<img src="<?php echo $wppost['_embedded']['wp:featuredmedia'][0]['source_url']; ?>" alt="<?php echo $wppost['_embedded']['wp:featuredmedia'][0]['alt_text']; ?>">
				<?php endif; ?>
			</div>
			<div class="wp-post-body">
				<h2><?php echo $wppost['title']['rendered']; ?></h2>
				<?php
				$a = new \DateTime($wppost['date']);
				$b = $a->format('Y-m-d');
				?>
				<div class="wp-post-date"><?php echo $b; ?></div>
				<div class="wp-post-excerpt">
					<?php echo $wppost['excerpt']['rendered']; ?>
				</div>
			</div>
		</div>
		</a>
	</div>

	<?php endforeach; ?>

</div>
<?php endif; ?>