How to check for null in Twig?

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Depending on what exactly you need:

  • is null checks whether the value is null:

     {% if var is null %}
     {# do something #}
 {% endif %}

  • is defined checks whether the variable is defined:

     {% if var is not defined %}
     {# do something #}
 {% endif %}

Additionally the is sameas test, which does a type strict comparison of two values, might be of interest for checking values other than null (like false):

{% if var is sameas(false) %}
    {# do something %}
{% endif %}

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