The Clipboard interface's readText() method returns a Promise which resolves with a copy of the textual contents of the system clipboard.

None.

A Promise that resolves with a string containing the textual contents of the clipboard. Returns an empty string if the clipboard is empty, does not contain text, or does not include a textual representation among the DataTransfer objects representing the clipboard's contents.

To read non-text contents from the clipboard, use the read() method instead. You can write text to the clipboard using writeText().

Transient user activation is required. The user has to interact with the page or a UI element in order for this feature to work.

The "clipboard-read" permission of the Permissions API must be granted before you can read data from the clipboard.

This example retrieves the textual contents of the clipboard and inserts the returned text into an element's contents.

navigator.clipboard
  .readText()
  .then((clipText) => (document.getElementById("outbox").innerText = clipText));

• Clipboard API
• Async Clipboard API demo on Glitch
• Image support for Async Clipboard article
• Clipboard.writeText()
• Clipboard.write()