Form Field Auto-Filler Generator

Generate a JS snippet to prefill form fields from URL parameters.

Example HTML

<form>
  <input type="text" name="email" placeholder="Email" />
  <input type="text" name="username" placeholder="Username" />
</form>

<!-- Example URL: yoursite.com?email=test@example.com&username=tester -->

JavaScript

document.addEventListener('DOMContentLoaded', () => {
  const params = new URLSearchParams(window.location.search);
  params.forEach((value, key) => {
    const field = document.querySelector(`[name="${key}"]`);
    if (field) {
      field.value = value;
    }
  });
});