This is a .NET library that makes it easy to use the Steam Web API. It conveniently wraps around all of the JSON data and ugly API details with clean methods, structures and classes.

json-data, steam, web-api
Install-Package SteamWebAPI2 -Version 4.0.9



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This is a .NET library that makes it easy to use the Steam Web API. It conveniently wraps around all of the JSON data and ugly API details with clean methods, structures and classes.

Please refer here for details regarding the Steam Web API, its endpoints, and how this library consumes them.

About this Library

This library was created to address the (at times) awful nature of the Steam Web API. Many of the exposed endpoints have little to no documentation on the parameters and absolutely no documentation on any of the responses. In addition, many of the endpoints do not follow any type of coding convention as it appears that different developers created different endpoints without collaborating with one another.

For example, some responses have a containing "response" object while others have a containing "result" object. To make it worse, some have a containing "results" or "responses" or "applist" or "playerstats" object or a number of other unconventional choices.

Instead of stressing about parsing the ugly JSON responses yourself, just use this library to make a method call and get back a response with everything in a more C#/.NET style. These are the rules on which the library was built:

  • Make the library as easy and user friendly as possible.
  • Document everything as thoroughly as possible.
  • Standardize all property names on returned JSON objects.
  • Deserialize UNIX TimeStamps to DateTime.
  • Deserialize "types" into enum where possible.
  • Clean up some of the more egregious JSON responses where JSON arrays should have been used but weren't.
  • Offer a sane way of handling the various representations and conversions of Steam ID by offering a SteamId class.
    • Handles legacy, modern, and 64-bit Steam Id representations

Install the Library from NuGet

See the library in the NuGet gallery here. You can install the library into your project directly from the package manager.

Install-Package SteamWebAPI2 

How Valve's Steam Web API is Architected

Gain a basic understanding of how Valve's Steam Web API is laid out: please see this helper site that I made to more easily describe the available endpoints.

How to Use the Library

  1. Read the About section so you understand why this library exists
  2. Install the library from NuGet
  3. Instantiate an object from any class that inherits from SteamWebInterface for whatever endpoint you want to use 1. Requires a Steam Web API developer key. Get one here. KEEP THIS SECRET. 2. Some endpoints require an AppId (such as 440 for Team Fortress 2)
  4. Call the method with your parameters that you want to use

The library is structured to mirror the endpoint structure. For example, the "DOTA2Econ" class will expose methods to communicate with the "IDOTA2Econ" endpoints.

Each method returns a SteamWebResponse object which contains the following:

Field Type Description
Data T Maps to the payload returned by the Steam Web API.
ContentLength long? Maps to the HTTP ContentLength header.
ContentType string Maps to the HTTP ContentType header.
ContentTypeCharSet string Maps to the HTTP ContentType charset header.
Expires DateTimeOffset? Maps to the HTTP Expires header. Optional.
LastModified DateTimeOffset? Maps to the HTTP LastModified header. Optional

Sample Usage

// this will map to the ISteamUser endpoint
var steamInterface = new SteamUser("<devKeyHere>");

// this will map to ISteamUser/GetPlayerSummaries method in the Steam Web API
// see PlayerSummaryResultContainer.cs for response documentation
var playerSummaryResponse = await steamInterface.GetPlayerSummaryAsync(<steamIdHere>);
var playerSummaryData = playerSummaryResponse.Data;
var playerSummaryLastModified = playerSummaryResponse.LastModified;

// this will map to ISteamUser/GetFriendsListAsync method in the Steam Web API
// see FriendListResultContainer.cs for response documentation
var friendsListResponse = await steamInterface.GetFriendsListAsync(<steamIdHere>);
var friendsList = friendsListResponse.Data;

Changes from 2.0 to 3.0

In versions previous to 3.0, numerical types were treated as short, int, and long. This caused problems when interacting with the Steam Web API because Valve accepts and returns unsigned numerical types. Instead of constantly reacting to overflows when a specific endpoint would return something outside the bounds of a 32-bit int, I decided to switch all numerical types to their unsigned counterparts.

Changes from 3.0 to 4.0

  • .NET Core is now supported.
  • All endpoints now return ISteamWebResponse where T is the response payload type. This allows more metadata to be returned with each end point such as HTTP headers and status messages in addition to the response payload.