Bug: 152435520

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  1. 8974491 Fix build files am: 0ff78890a3 am: 2f86351634 am: ce5fc510cf am: 542662f593 by Jorge E. Moreira · 8 months ago main-16k-with-phones master
  2. 542662f Fix build files am: 0ff78890a3 am: 2f86351634 am: ce5fc510cf by Jorge E. Moreira · 8 months ago
  3. ce5fc51 Fix build files am: 0ff78890a3 am: 2f86351634 by Jorge E. Moreira · 8 months ago
  4. 2f86351 Fix build files am: 0ff78890a3 by Jorge E. Moreira · 8 months ago main-16k
  5. 0ff7889 Fix build files by Jorge E. Moreira · 8 months ago

CI status Coverity Scan Build Status CII Best Practices Codacy Badge Total alerts Language grade: C/C++ Language grade: JavaScript


Libwebsockets is a simple-to-use, MIT-license, pure C library providing client and server for http/1, http/2, websockets, MQTT and other protocols in a security-minded, lightweight, configurable, scalable and flexible way. It's easy to build and cross-build via cmake and is suitable for tasks from embedded RTOS through mass cloud serving.

It supports a lot of lightweight ancilliary implementations for things like JSON, CBOR, JOSE, COSE, and supports OpenSSL and MbedTLS v2 and v3 out of the box for everything. It's very gregarious when it comes to event loop sharing, supporting libuv, libevent, libev, sdevent, glib and uloop, as well as custom event libs.

100+ independent minimal examples for various scenarios, CC0-licensed (public domain) for cut-and-paste, allow you to get started quickly.

There are a lot of READMEs on a variety of topics.

We do a huge amount of CI testing per push, currently 582 builds on 30 platforms. You can see the lws CI rack and read about how lws-based Sai is used to coordinate all the testing.



v4.3 is released

See the changelog

Lws work retrospective

The initial commit for lws will have been 11 years ago come Oct 28 2021, it's been a lot of work. There are a total of 4.3K patches, touching 800KLOC cumulatively (this is not the size in the repo, but over the years, how many source lines were changed by patches).


Gratifyingly, it turns out over the years, ~15% of that was contributed by 404 contributors: that's not so bad. Thanks a lot to everyone who has provided patches.

Today at least tens of millions of devices and product features rely on lws to handle their communications including several from FAANG; Google now include lws as part of Android sources.


This is the libwebsockets C library for lightweight websocket clients and servers. For support, visit


and consider joining the project mailing list at


You can get the latest version of the library from git:

Doxygen API docs for development: https://libwebsockets.org/lws-api-doc-main/html/index.html