I have seen a good many of people try to clear each form input after submission one value at a time. Although this is a very short code example I think it's important to know that you can clear and entire form by selecting the id attached to the form tag.

ocument.getElementById('my-form').reset()
document
    .getElementById("my-form")
    .addEventListener("submit", function(event) {
      event.preventDefault();
      document.getElementById("my-form").reset();
    });
<form id="my-form">
      <input placeholder="name" /> <input placeholder="email" />
      <button type="submit">Submit</button>
    </form>