IXWebSocket is a C++ library for client and server Websocket communication, and for client HTTP communication.

Following platforms are supported: * macOS * iOS * Linux * Android * Windows (no TLS)

Programming language: C++
Tags: Networking     Message Passing     Android     iOS     Windows     Linux     Osx     WebSocket     C++14    
Latest version: v10.4.0

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Hello world

IXWebSocket is a C++ library for WebSocket client and server development. It has minimal dependencies (no boost), is very simple to use and support everything you'll likely need for websocket dev (SSL, deflate compression, compiles on most platforms, etc...). HTTP client and server code is also available, but it hasn't received as much testing.

It is been used on big mobile video game titles sending and receiving tons of messages since 2017 (iOS and Android). It was tested on macOS, iOS, Linux, Android, Windows and FreeBSD. Note that the MinGW compiler is not supported at this point. Two important design goals are simplicity and correctness.

 *  main.cpp
 *  Author: Benjamin Sergeant
 *  Copyright (c) 2020 Machine Zone, Inc. All rights reserved.
 *  Super simple standalone example. See ws folder, unittest and doc/usage.md for more.
 *  On macOS
 *  $ mkdir -p build ; cd build ; cmake -DUSE_TLS=1 .. ; make -j ; make install
 *  $ clang++ --std=c++14 --stdlib=libc++ main.cpp -lixwebsocket -lz -framework Security -framework Foundation
 *  $ ./a.out

#include <ixwebsocket/IXNetSystem.h>
#include <ixwebsocket/IXWebSocket.h>
#include <iostream>

int main()
    // Required on Windows

    // Our websocket object
    ix::WebSocket webSocket;

    std::string url("wss://echo.websocket.org");

    std::cout << "Connecting to " << url << "..." << std::endl;

    // Setup a callback to be fired (in a background thread, watch out for race conditions !)
    // when a message or an event (open, close, error) is received
    webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg)
            if (msg->type == ix::WebSocketMessageType::Message)
                std::cout << "received message: " << msg->str << std::endl;
            else if (msg->type == ix::WebSocketMessageType::Open)
                std::cout << "Connection established" << std::endl;

    // Now that our callback is setup, we can start our background thread and receive messages

    // Send a message to the server (default to TEXT mode)
    webSocket.send("hello world");

    while (true)
        std::string text;
        std::cout << "> " << std::flush;
        std::getline(std::cin, text);


    return 0;

Interested? Go read the docs! If things don't work as expected, please create an issue on GitHub, or even better a pull request if you know how to fix your problem.

IXWebSocket is actively being developed, check out the changelog to know what's cooking. If you are looking for a real time messaging service (the chat-like 'server' your websocket code will talk to) with many features such as history, backed by Redis, look at cobra.

IXWebSocket client code is autobahn compliant beginning with the 6.0.0 version. See the current test results. Some tests are still failing in the server code.


If your company or project is using this library, feel free to open an issue or PR to amend this list.

  • Machine Zone
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Continuous Integration

OS TLS Sanitizer Status
Linux OpenSSL None Build2
macOS Secure Transport Thread Sanitizer Build2
macOS OpenSSL Thread Sanitizer Build2
macOS MbedTLS Thread Sanitizer Build2
Windows Disabled None Build2
UWP Disabled None Build2