gistfile1.js

var key = 'pk_test_czwzkTp2tactuLOEOqbMTRzG';
var params = {
    'card[number]': '4242 4242 4242 4242',
        'card[exp_month]': '01',
        'card[exp_year]': '2050'
};

$.ajax({
    url: 'https://api.stripe.com/v1/tokens',
    method: 'POST',
    dataType: 'json',
    headers: {
        'Authorization': 'Bearer ' + key
    },
    crossDomain: true,
    xhrFields: {
        withCredentials: true
    },
    data: params
}).success(function (token) {
    // We have a token
    console.log(token);

}).error(function (ajax) {
    if (ajax.responseText) {
        console.log(JSON.parse(ajax.responseText));
    }
});