In order to define a bootstrap menu item as “active” in a Symfony 5 project, you can add

{% set route_name = app.request.attributes.get('_route') %}

to the top of your base.html.twig. Then a twig condition in the navbar can be implemented as follows:

<li {% if route_name == "user_index" %} class="nav-item active" {% else %} class="nav-item" {% endif %} >

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