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You can display a preloader element while waiting for a server response using fetch by following these steps:

1. Create a variable that references the element to be displayed as the preloader.

   const preloader = document.querySelector('.preloader');
   

2. Before making the fetch request, display the preloader element.

   preloader.style.display = 'block';
   

3. Make the fetch request as you would normally.

   fetch('/api/data')
    .then(response => response.json())
    .then(data => {
      // handle the data returned
    })
    .catch(error => {
      // handle any errors
    });
   

4. After the request is complete, hide the preloader element.

   preloader.style.display = 'none';
   

Here's the complete example:

const preloader = document.querySelector('.preloader');

preloader.style.display = 'block';

fetch('/api/data')
  .then(response => response.json())
  .then(data => {
    // handle the data returned

    preloader.style.display = 'none';
  })
  .catch(error => {
    // handle any errors

    preloader.style.display = 'none';
  });