var steam = require('steam-web');

var s = new steam({
  apiKey: 'XXXXXXXXXXXXXXXX',
  format: 'json' //optional ['json', 'xml', 'vdf']
});

s.getNewsForApp({
  appid: 440,
  count: 3,
  maxlength: 300,
  callback: function(err, data) {
    console.log(data);
  }
})
s.getGlobalAchievementPercentagesForApp({
  gameid: 440,
  callback: function(err, data) {
    console.log(data);
  }
});
s.getPlayerSummaries({
  steamids: ['76561198037414410', '76561197960435530'],
  callback: function(err, data) {
    console.log(data);
  }
})
s.getFriendList({
  steamid: '76561197960435530',
  relationship: 'all', //'all' or 'friend'
  callback: function(err,data) {
    console.log(data);
  },
})
s.getSchema({
  gameid: 440,
  callback: function(err, data) {
    console.log(data);
  }
})
s.getPlayerItems({
  gameid: 440,
  steamid: '76561197960435530',
  callback: function(err, data) {
    console.log(data);
  }
})
s.getAssetPrices({
  appid: 440,  //can also use gameid instead for convenience
  callback: function(err,data) {
    console.log(data);
  }
})

There are two ways to use getAssetClassInfo.  By default, the Steam API
wants a query string formatted as: ?classid0=1234&classid1=5678&class_count=2

As such, you can either manually generate the keys and call the method like this:

s.getAssetClassInfo({
  appid: 440, //can also use gameid instead for convenience
  classid0: '16891096',
  classid1: 151,
  class_count: 2,
  callback: function(err,data) {
    console.log(data);
  }
})

OR, I've provided a convenience property so you can just pass an array of ids
(when using the convenience property, you don't need to pass class_count either)

s.getAssetClassInfo({
  appid: 440, //can also use gameid instead for convenience
  classIds: ['16891096',151],
  callback: function(err,data) {
    console.log(data);
  }
})