how to pass parameter in fetch code example

Example: fetch and then javascript send parameters

const url = 'https://randomuser.me/api';
// The data we are going to send in our request
let data = {
    name: 'Sara'
}
// The parameters we are gonna pass to the fetch function
let fetchData = { 
    method: 'POST', 
    body: data,
    headers: new Headers()
}
fetch(url, fetchData)
.then(function() {
    // Handle response you get from the server
});