[javascript] How do I post form data with fetch api?

Use FormData and fetch to grab and send data

fetch(form.action, {method:'post', body: new FormData(form)});

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function send(e,form) {
  fetch(form.action, {method:'post', body: new FormData(form)});

  console.log('We send post asynchronously (AJAX)');
  e.preventDefault();
}
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<form method="POST" action="myapi/send" onsubmit="send(event,this)">
    <input hidden name="crsfToken" value="a1e24s1">
    <input name="email" value="[email protected]">
    <input name="phone" value="123-456-789">
    <input type="submit">    
</form>

Look on chrome console>network before/after 'submit'
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