ghost api call authentication token

ghost_api.js

var postData = querystring.stringify({
  grant_type: "password",
  username: "<username>",
  password: "<password>",
  client_id: "ghost-admin"
});

var uriBase = '/ghost/api/v0.1/';

var requestOptions = {
  host: 'hostname',
  port: 80,
  path: uriBase + 'authentication/token',
  method: 'POST',
  headers: {
    'Content-Type': 'application/x-www-form-urlencoded',
    'Accept': 'application/json'
  }
};

var request = http.request(requestOptions, function(response) {
  response.setEncoding('utf8');
  var authData = '';
  response.on('data', function(chunk) {
    authData += chunk;
  })
  response.on('end', function() {
    var auth = JSON.parse(authData);
  
    console.log(auth);
  
    requestOptions.headers.Authorization = auth.token_type + ' ' + auth.access_token;
  
    var apiOptions = {
      url: 'http://' + requestOptions.host + ':' + requestOptions.port + uriBase + '/users/me',
      headers: requestOptions.headers
    };
  
    function callback(error, response, body) {
      if (!error && response.statusCode == 200) {
        var info = JSON.parse(body);
        console.log(info);
      }
    }
  
    requester(apiOptions, callback);
  });
});

request.write(postData);
request.end();