JSFiddle - React, Tailwind, and code Playground

JavaScript

function asNull (id, culture) {
  if (culture === undefined) {
    culture = null;
  }
  console.log("backoffice/UmbNav/UmbNavEntityApi/GetById?id=" + id + "&culture=" + culture);
}

asNull(1);

function asString (id, culture = "null") {
  console.log("backoffice/UmbNav/UmbNavEntityApi/GetById?id=" + id + "&culture=" + culture);
}

asString(1);

function withTemplate (id, culture = "null") {
  console.log(`backoffice/UmbNav/UmbNavEntityApi/GetById?id=${id}&culture=${culture}`);
}

withTemplate(1);