JAVASCRIPT

sending json data uing fetch is empty

			let datastring =  {
                submit: true,
				firstname: 'Kumar',
				lastname: 'D',
				email: 'kumar@test.com'
            }
            fetch('http://localhost.com/index_json_data.php', {
                method: 'POST',
                headers: {
                    'Accept': 'application/json, text/plain, */*',
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify(datastring),
            }).then(res => res.json())
              .then(res => console.log('after submit', res));

///// index_json_data.php PHP Code //////////
<?php
$json = file_get_contents('php://input');
// Converts it into a PHP object
$data = json_decode($json);
print_r($data); 
// Converts it into a PHP Array
$data = json_decode($json,true);
exit;
?>

sending json data uing fetch is empty

var myHeaders = new Headers();
myHeaders.append('Content-Type', 'application/json');

fetch('/contact-form', {
    method: 'POST',
    headers: myHeaders,
    mode: 'cors',
    cache: 'default',
    body: JSON.stringify(fields)
}).then(() => {
    dispatch(contactFormSubmitSuccess());
});

sending json data uing fetch is empty

fetch('/api/v1/users', {  
    method: 'post',
    headers: {'Content-Type': 'application/json'},
    body: JSON.stringify({ "user": {
      "email" : email,
      "password" : password
    }}),
})