Paste te Result of your clipboard on a console.

background.js

/*
 Paste te Result of your clipboard on a console.
 In background.js of a chrome extension and permission of clipboardRead and clipboardWrite on the manifest
*/
setInterval(()=>{
  let tempT = document.querySelector('#clipboard');
  let textArea = !!tempT ? tempT : document.createElement("textarea");
  textArea.id = 'clipboard'
  document.body.appendChild(textArea);
  textArea.select();
  document.execCommand("Paste");
  console.log(textArea.value);
}, 1000)