Nightmare Async Example

index.js

var Nightmare = require('nightmare');
var async = require ('async');
var urls = ['https://segment.com/', 'http://www.nytimes.com/', 'http://www.gnu.org/'];

function test(url, cb) {
  console.log('test: ' + url);
  var nightmare = new Nightmare();
  nightmare
    .goto(url)
    .evaluate(function () {
      return document.documentElement.innerHTML;
    }, function (res) {
      console.log('evaluate: ' + url);
    })
    .run(function (err, nightmare) {
      console.log('run: ' + url);
      cb();
    });

}

async.each(urls, test, function (err) {
  console.log('done!');
});

output.txt

test: https://segment.com/
test: http://www.nytimes.com/
test: http://www.gnu.org/
evaluate: http://www.gnu.org/
run: http://www.gnu.org/