for fetch with promise javascript code example

Example 1: fetch

var formData = new FormData();
var fileField = document.querySelector("input[type='file']");

formData.append('username', 'abc123');
formData.append('avatar', fileField.files[0]);

fetch('https://example.com/profile/avatar', {
  method: 'PUT',
  body: formData
})
.then(response => response.json())
.catch(error => console.error('Error:', error))
.then(response => console.log('Success:', response));

Example 2: javascript fetch get data from promise

var x = fetch(SOME_URL, SOME_POST_DATA)
    .then((response) => response.json())
    .then((responseJSON) => {
       // do stuff with responseJSON here...
       console.log(responseJSON);
    });