The data read-only property of the InputEvent interface returns a string with inserted characters. This may be an empty string if the change doesn't insert text, such as when characters are deleted.
A string or null. The spec has an overview of its value in various cases.
In the following example, an event listener receives the input event. Any textual change to the <input> element is retrieved by InputEvent.data and inserted into a paragraph using the Node.textContent property.
<p>Some text to copy and paste.</p>
<input type="text" />
<p class="result"></p>const editable = document.querySelector("input");
const result = document.querySelector(".result");
editable.addEventListener("input", (e) => {
result.textContent = `Inputted text: ${e.data}`;
});