fetch api cors

fetch(URL, {
  mode: 'cors',
  headers: {
    'Access-Control-Allow-Origin':'*'
  }
})
  .then(response => response.json())
  .then(data => {

// From http://foo.com/
fetch('http://bar.com/data.json', { 
    mode: 'no-cors' // 'cors' by default
}).then(function(response) {
    // Do something with response
});

//Obj of data to send in future like a dummyDb
const data = { username: 'example' };

//POST request with body equal on data in JSON format
fetch('https://example.com/profile', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify(data),
})
.then((response) => response.json())
//Then with the data from the response in JSON...
.then((data) => {
  console.log('Success:', data);
})
//Then with the error genereted...
.catch((error) => {
  console.error('Error:', error);
});

//																		Yeah

fetch(URL, {
  mode: 'cors',
  headers: {
    'Access-Control-Allow-Origin':'*'
  }
})
  .then(response => response.json())
  .then(data => {