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Steam for Node.js

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This is a Node.js port of SteamKit2. It lets you interface with Steam without running an actual Steam client. Could be used to run an autonomous chat/trade bot.


npm install steam

Note: installing from git requires svn to fetch Steam resources (Protobufs and SteamLanguage) and curl to fetch the server list.

Note: only Node.js v4.1.1 and above is supported.


First, require this module.

var Steam = require('steam');

Steam is now a namespace object containing:

Then you'll want to create an instance of SteamClient and any handlers you need, call SteamClient#connect and assign event listeners.

var steamClient = new Steam.SteamClient();
var steamUser = new Steam.SteamUser(steamClient);
steamClient.on('connected', function() {
    account_name: 'username',
    password: 'password'
steamClient.on('logOnResponse', function() { /* ... */});

See example.js for the usage of some of the available API.


Steam.servers contains the list of CM servers node-steam will attempt to connect to. The bootstrapped list (fetched in prepare) can get out of date and thus contain dead servers. To avoid timeouts, replace it with your own list before logging in if you have one (see 'servers' event).


Since JavaScript's Number type does not have enough precision to store 64-bit integers, SteamIDs are represented as decimal strings. (Just wrap the number in quotes)


Whenever a method accepts (or an event provides) an ESomething, it's a Number that represents some enum value. See enums.steamd and eresult.steamd for the whole list of them. For each enum, there is an equivalently named property on Steam. The property is an object; for each of the enum's members, there is an equivalently named property on the object with an equivalent value.

Note that you can't easily get the string value from the number, but you probably don't need to. You can still use them in conditions (e.g. if (type == Steam.EChatEntryType.Emote) ...) or switch statements.


Whenever a method accepts (or an event provides) a CMsgSomething, it's an object that represents a protobuf message. It has an equivalently named property for each set field in the specified message with the type as follows:

  • (u)int32 and fixed32 fields: Number
  • uint64, fixed64 and string fields: String
  • bytes fields: Buffer objects
  • bool fields: Boolean

See the wiki for descriptions of protobuf fields.


Most of the API is provided by handler classes that internally send and receive low-level client messages using 'message'/send:

If you think some unimplemented functionality belongs in one of the existing handlers, feel free to submit an issue to discuss it.




A boolean that indicates whether you are currently connected and the encryption handshake is complete. 'connected' is emitted when it changes to true, and 'error' is emitted when it changes to false unless you called disconnect. Sending any client messages is only allowed while this is true.


A boolean that indicates whether you are currently logged on. Calling any handler methods other than SteamUser#logOn is only allowed while logged on.


Your session ID while logged on, otherwise unspecified. (Note: this has nothing to do with the "sessionid" cookie)


Your own SteamID while logged on, otherwise unspecified. Must be set to a valid initial value before sending a logon message (SteamUser#logOn does that for you).



Connects to Steam. It will keep trying to reconnect until encryption handshake is complete (see 'connected'), unless you cancel it with disconnect.

You can call this method at any time. If you are already connected, disconnects you first. If there is an ongoing connection attempt, cancels it.


Immediately terminates the connection and prevents any events (including 'error') from being emitted until you connect again. If you are already disconnected, does nothing. If there is an ongoing connection attempt, cancels it.



Connection closed by the server. Only emitted if the encryption handshake is complete, otherwise it will reconnect automatically. loggedOn is now false.


Encryption handshake complete. From now on, it's your responsibility to handle disconnections and reconnect (see 'error'). You'll likely want to log on now (see SteamUser#logOn).


Logon response received. If eresult is EResult.OK, loggedOn is now true.


  • an Array containing the up-to-date server list

node-steam will use this new list when reconnecting, but it will be lost when your application restarts. You might want to save it to a file or a database and assign it to Steam.servers before logging in next time.

Note that Steam.servers will be automatically updated after this event is emitted. This will be useful if you want to compare the old list with the new one for some reason - otherwise it shouldn't matter.


  • EResult

You were logged off from Steam. loggedOn is now false.


Sending and receiving client messages is designed to be symmetrical, so the event and the method are documented together. Both have the following arguments:

  • header - an object representing the message header. It has the following properties:
    • msg - EMsg (no protomask).
    • proto - a CMsgProtoBufHeader object if this message is protobuf-backed, otherwise header.proto is falsy. The following fields are reserved for internal use and shall be ignored: steamid, client_sessionid, jobid_source, jobid_target. (Note: pass an empty object if you don't need to set any fields)
  • body - a Buffer containing the rest of the message. (Note: in SteamKit2's terms, this is "Body" plus "Payload")
  • callback (optional) - if not falsy, then this message is a request, and callback shall be called with any response to it instead of 'message'/send. callback has the same arguments as 'message'/send.




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