check http status code using nightwatch

Supplementing to Hilarion Galushka's answer: you can use the perform() command from nightwatch to intergrate request and assert into your nightwatch tests. http://nightwatchjs.org/api/perform.html

For example:

module.exports = {
    'test response code': function (browser) {
        browser.perform(done => {
            request('http://stackoverflow.com', function (error, response, body) {
                browser.assert.equal(response.statusCode, 200);
                done()
            });
        })
    }
}