Netty: Home Skip navigation Toggle navigation Netty project News Archive Downloads 5.0.0.Alpha5 ‐ 28-Sep-2022 4.2.17.Final ‐ 04-Aug-2026 4.1.137.Final ‐ 06-Aug-2026 4.0.56.Final ‐ 05-Feb-2018 3.10.6.Final ‐ 29-Jun-2016 Apache License 2.0 Previous Releases Nightly Builds Documentation User guide Javadoc - 5.0 Javadoc - 4.2 Javadoc - 4.1 Javadoc - 4.0 Javadoc - 3.10 All Documents Related Articles Use code mlnettyco for a 37% discount! Get Involved Github StackOverflow @netty_project Developer Guide Discord Server Sponsors Adopters Related Projects Use code mlnettyco for a 37% discount! Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Netty is an NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server. 'Quick and easy' doesn't mean that a resulting application will suffer from a maintainability or a performance issue. Netty has been designed carefully with the experiences earned from the implementation of a lot of protocols such as FTP, SMTP, HTTP, and various binary and text-based legacy protocols. As a result, Netty has succeeded to find a way to achieve ease of development, performance, stability, and flexibility without a compromise. Features Design Unified API for various transport types - blocking and non-blocking socket Based on a flexible and extensible event model which allows clear separation of concerns Highly customizable thread model - single thread, one or more thread pools such as SEDA True connectionless datagram socket support (since 3.1) Ease of use Well-documented Javadoc, user guide and examples No additional dependencies, JDK 5 (Netty 3.x) or 6 (Netty 4.x) is enough Note: Some components such as HTTP/2 might have more requirements. Please refer to the Requirements page for more information. Performance Better throughput, lower latency Less resource consumption Minimized unnecessary memory copy Security Complete SSL/TLS and StartTLS support Community Release early, release often The author has been writing similar frameworks since 2003 and he still finds your feed back precious! Copyright © 2026 The Netty project