text-display/public/js/main.js

!async function(){
  let data = await fetch(location.protocol + "/api")
      .then((response) => response.text())
      .then(data => {
          return data;
      })
      .catch(error => {
          console.error(error);
      });
  
  console.log(data);
  print(data);
  }();

function print(data) {
  document.getElementById("text").innerText = data
  document.getElementById("text").value = data
}