app.js

var OAuth   = require('oauth').OAuth;
var baseURL = 'https://passport.vml.com';

consumer = new OAuth(
  baseURL + '/oauth/request_token',
  baseURL + '/oauth/access_token',
  'w9hJkqLgqRR9mPdrmxyh76qxMrnG3CeD',
  '4TAfNxp2JCwCYz4Tn8hP8bwuHe7PWdjK',
  '1.0', null, 'HMAC-SHA1'
);

consumer.getOAuthRequestToken(function(err, requestToken, requestTokenSecret){
  console.log(err);
  console.log('Request Token:         ', requestToken);
  console.log('Request Token Secret:  ', requestTokenSecret);

  consumer.getOAuthAccessToken(requestToken, requestTokenSecret, function(err, accessToken, accessTokenSecret){
    console.log(err);
    console.log('Access Token:          ', accessToken);
    console.log('Access Token Secret:   ', accessTokenSecret);

    consumer.get(
      baseURL + '/api/search/user_index/list.json?limit=300',
      accessToken,
      accessTokenSecret,
      function(err, data, res){
        console.log(err);
        console.log(data);
      }
    );
  });
});