The json filter will convert any variable to json string.
twig
{{ [1, 2, 3] | json }}
{# results in: '[1, 2, 3]' #}
{{ true | json }}
{# results in: 'true' #}
{{ "foo" | json }}
{# results in: '"foo"' #}The json filter will convert any variable to json string.
{{ [1, 2, 3] | json }}
{# results in: '[1, 2, 3]' #}
{{ true | json }}
{# results in: 'true' #}
{{ "foo" | json }}
{# results in: '"foo"' #}