urfatBro/public/plugins/remoteFill/remoteFill.js

(function ($) {

    $.fn.remoteFill = function (target = false) {
        var location = $(this);

        let cep = $(this).parent().find('input').val();
        cep = String(cep).replace(/[^\d]/g, '');

        fetch('/postal/search/' + cep, {
            method: 'GET',
            headers: {
                'Content-Type': 'application/x-www-form-urlencoded',
                'X-Requested-With': 'fetch'
            }
        }).then(function (response) {
            let json = response.json();
            return json;
        }).then(function(json){
            target(json)
        });
    };

})(jQuery);