Convert FormData to Query String

formdata-to-string.js

function handleSubmit(event) {
  event.preventDefault();
  const formData = new FormData(event.target);
  const data = [...formData.entries()];
  const asString = data
      .map(x => `${encodeURIComponent(x[0])}=${encodeURIComponent(x[1])}`)
      .join('&');
  console.log(asString);
}