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function copyToClipboard(textToClipboard)
{
  var textarea = document.createElement("TEXTAREA");
  textarea.value= textToClipboard;
  document.body.appendChild(textarea);
  textarea.select();
 
  try
  {
    var successful = document.execCommand('copy');
    document.body.removeChild(textarea);
    return successful
  }
  catch(err)
  {
    document.body.removeChild(textarea);
    return false
  }
}

axios.get('apiUrl')
  .then(function (response){
    const result = copyToClipboard(
      JSON.parse(response.request.responseText).textToClipboard;
    );
    console.log(result); //false
  });