HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery checked validation</title>
  <style>
    form { border: 1px solid #cbd5e1; padding: 16px; max-width: 320px; }
    label { display: block; margin: 8px 0; }
  </style>
</head>
<body>
  <form id="termsForm">
    <label><input type="checkbox" name="terms"> I accept the terms</label>
    <label><input type="checkbox" name="privacy"> I accept the privacy policy</label>
    <button type="submit">Submit</button>
  </form>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#termsForm").on("submit", function(e) {
      if ($("#termsForm input:checkbox:checked").length === 0) {
        e.preventDefault();
        alert("Please accept at least one option.");
      } else {
        alert("Form submitted!");
        e.preventDefault();
      }
    });
  </script>
</body>
</html>

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jQuery require one checkbox:checked (Try It)