lang/js/ ClipboardApi

See also CopyToClipbard.

The mozilla docs. Also this stackoverflow question.

With async/await syntax:

const text = await navigator.clipboard.readText();

Or with Promise syntax:

navigator.clipboard.readText()
  .then(text => {
    console.log('Pasted content: ', text);
  })
  .catch(err => {
    console.error('Failed to read clipboard contents: ', err);
  });