var request = require('request');

var jar = request.jar();
jar.setCookie(request.cookie('foo=bar'), 'http://mockbin.com/har');
jar.setCookie(request.cookie('bar=baz'), 'http://mockbin.com/har');

var options = {
  method: 'POST',
  url: 'http://mockbin.com/har',
  qs: { foo: ['bar', 'baz'], baz: 'abc', key: 'value' },
  headers: {
    'content-type': 'application/x-www-form-urlencoded',
    accept: 'application/json'
  },
  form: { foo: 'bar' },
  jar: 'JAR'
};

request(options, function(error, response, body) {
  if (error) throw new Error(error);

  console.log(body);
});