To get the last child of a parent element, you can use the lastElementChild property in the DOM element in JavaScript.

Let's say we have a parent element div and three paragragh tags inside it like this,

<div id="container">
  <p>Paragraph 1</p>
  <p>Paragraph 2</p>
  <p>Paragraph 3</p>
</div>

Now let's get the last paragraph element from the div tag.

To get the last paragragh element, last we have to get a reference to the div tag and then use the lastElementChild property like this,

// get refernece to tht div tag
const div = document.querySelector("#container");

// ge the last child element
const lastChild = div.lastElementChild;

console.dir(lastChild); // last p tag properties and methods

See this example live in JSBin.

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