Debugging Twig

Poor man's debug

This will print all the keys of all data available. We don't print value as that can sometimes throw a fatal error in Drupal b/c it's trying to access a private property or class.

<ol>
  {% for key,value in _context %}
    <li>{{ key }}</li>
  {% endfor %}
</ol>

Full JSON output

<pre><code>{{ _context|json_encode(constant('JSON_PRETTY_PRINT')) }}</code></pre>

Be careful with a full _context output as that can be crazy in Drupal, often it's best to dump specific variables.