jQuery validate show errors summary programatically

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.13.1/jquery.validate.min.js"></script>
<form>
    <input name="input" />
    <a href="#" id="checkField">Check field</a>
    <a href="#" id="checkForm">Check form</a>
</form>

JavaScript

$("form").validator();
$("#checkField").on("click", function() {
    $("form").valid();
    var validator = $("form").validator();
    validator.showErrors({ "input": ["El peor error del mundo"] });
    return false;
});j