Paste onto a [contenteditable] element as plain text

paste.js

document.querySelector('[contenteditable]').addEventListener('paste', function (event) {
  event.preventDefault();
  document.execCommand('inserttext', false, event.clipboardData.getData('text/plain'));
});

@jp3492 See here. https://htmldom.dev/paste-as-plain-text/

As @jp3492 has said, the execCommand API is deprecated. The following code works the same by just setting the inner text of the target element.

function pasteAsPlainText(event) {
  event.preventDefault();
  event.target.innerText = event.clipboardData.getData("text/plain");
}