How to process JSON from the server so that tags in the JSON file fire when displayed on the site?

Question

MongoDB

Hello everyone, tell me how to process JSON from the server so that tags in the JSON file work when displayed on the site. I accept a string, there is text and tags, everything is inserted in one heap.
Just like in this form I write here - this is a textarea, and when I click Publish, I see the text with processed tags and line breaks.
When developing, I use nodejs, express, pug, mongodb, mongoose, to process formidable forms.

Answer 1

-
  var data = {
    html: '<ul><li>1</li></ul>'
  };

//- вставится с экранированием
div #{data.html}

//- вставится без экранирования
div !{data.html}

Answer 2

look at the template engine so that html is left as it is
in Dzhang, for example
{{ variable |safe}}