I have a twig file of a custom module. It has a <script></script> section and I need to print a twig variable inside that section. How do I do this?

{{ set twigVariable = '123456' }}

    function myFunc() {
        var myJsVar = {{ twigVariable }};

The variable does not print when I write like above.

  • 6
    Don’t do this. Use drupalSettings, construct values in a module or preprocess and attach them.
    – Kevin
    Commented May 21, 2018 at 9:57
  • Is there a reason that you say don't do this? @Kevin Commented May 21, 2018 at 11:25
  • 4
    Because it is bad practice to mix up theming and functional parts as JavaScript in a template. You should keep your templates clean and use template pre-processing to attach any scripts or script settings required by your frontend features. Commented May 21, 2018 at 11:30

1 Answer 1


I'll spare to tell that it's a bad practice to add custom script blocks to templates, and just point out the error(s):

(1) To set the variable content, you have to wrap set into a {% %} block, not {{ }}.

(2) You most probably want the value as JavaScript string, so don't forget to wrap it in " ".

This sums up to

{% set twigVariable = '123456' %}

  function myFunc() {
    var myJsVar = "{{ twigVariable }}";

Which should be working just fine.

  • 1
    This is not going to work because of the cache.
    – gagarine
    Commented Jun 13, 2020 at 20:29

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