Why doesn't PHP accept JSON sent via AJAX?

Question

PHP

Sorry if this is a dumb question, I've been looking for a solution but haven't found anything yet. I'm most likely missing something.
Problem:
I'm using AJAX to send data using the POST method to a php file, the object is converted to json:

const body = {
  name: 'ilya',
  email: '[email protected]'
}

let xhr = new XMLHttpRequest();
xhr.open('POST', 'newtest.php');
xhr.responseType = 'json';
xhr.setRequestHeader('Content-Type', 'application/json')
xhr.send(JSON.stringify(body))

It seems like the data is being transferred:

But I can't accept them in newtest.php in any way. This:

<?php
$input = json_decode(file_get_contents("php://input"), true);
  print_r($input);
?>

produces null.
Just accepting through the post also does not work.
Please, if possible, explain in detail to the ax where I'm screwing up, maybe it's impossible at all?

Answer 1

Do like this:

async function sendPOST() {
  
  try {
    
    var formData = new FormData();
    formData.append('name', 'Илья');
    formData.append('email', '[email protected]');

    var response = await (await fetch('newtest.php', {
      method: 'POST',
      body: formData
    })).text();

    console.log("POST-запрос отправлен успешно. Ответ сервера:\n" + response);

    return response;
    
  }
  
  catch (err) {
    
    console.log('При отправке POST-запроса произошла ошибка:');
    console.dir(err);
    
    return false;
    
  }
  
}

To send a request, you call the function sendPOST()
Inside the PHP handler, while looking at the $_POST global variable like this:

<?php
print_r($_POST);
?>

Answer 2

Try to set a negative offset for the test, so that the file is read from the end of the stream. And you must first simply display through var_dump what comes in file_get_contents