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ZeroMQ (also spelled ØMQ, 0MQ or ZMQ) is a high-performance asynchronous messaging library, aimed at use in distributed or concurrent applications. It provides a message queue, but unlike message-oriented middleware, a ZeroMQ system can run without a dedicated message broker.

ZeroMQ supports common messaging patterns (pub/sub, request/reply, client/server and others) over a variety of transports (TCP, in-process, inter-process, multicast, WebSocket and more), making inter-process messaging as simple as inter-thread messaging. This keeps your code clear, modular and extremely easy to scale.

ZeroMQ is developed by a large community of contributors. There are third-party bindings for many popular programming languages and native ports for C# and Java.

The Zero in ZeroMQ

The philosophy of ZeroMQ starts with the zero. The zero is for zero broker (ZeroMQ is brokerless), zero latency, zero cost (it’s free), and zero administration.

More generally, “zero” refers to the culture of minimalism that permeates the project. We add power by removing complexity rather than by exposing new functionality.

The Guide

The guide explains how to use ØMQ, covers basic, intermediate and advanced use with 60+ diagrams and 750 examples in 28 languages.

Also available as a book O’Reilly.

Libzmq - the low level library

Libzmq ( is the low-level library behind most of the different language bindings. Libzmq expose C-API and implemented in C++. You will rarely use libzmq directly, however if you want to contribute to the project or learn the internals of zeromq, that is the place to start.

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