About ProtocolLib

The packet manipulation library that became essential infrastructure for Minecraft server development.

What is ProtocolLib?

ProtocolLib is a server-side library plugin for Bukkit, Spigot, and Paper that gives developers direct read and write access to the Minecraft network protocol. It provides a clean, event-driven API for intercepting, modifying, cancelling, and injecting raw packets — without requiring developers to touch obfuscated NMS internals or work with Netty directly.

For Minecraft server developers, ProtocolLib is the go-to tool for anything packet-related. It powers anti-cheat systems, hologram plugins, NPC frameworks, tab list customization, chat formatting, and hundreds of other plugins that need low-level protocol access.

1.3k+ GitHub Stars
625k+ Downloads
1.8 – 1.21 MC Version Range

The Story Behind ProtocolLib

ProtocolLib started as a solution to a real problem. Minecraft plugin developers who needed packet-level access had two options: hook directly into Minecraft’s obfuscated server code (NMS), or write raw Netty channel handlers. Both approaches broke with every Minecraft update and required deep knowledge of server internals.

Kristian Strangeland (known as aadnk on GitHub) built ProtocolLib to abstract away that complexity. The library wrapped packet handling in a stable, versioned API so plugins could work with protocol data through clean method calls instead of reflection hacks.

Early Development

Kristian Strangeland creates ProtocolLib as a Bukkit plugin, providing the first stable packet interception API for server developers.

Community Adoption

ProtocolLib gains traction on BukkitDev. Plugin developers start depending on it for anti-cheat, hologram, and NPC functionality. The library becomes a soft dependency for dozens of popular plugins.

Maintainer Transition

Dan Mulloy (dmulloy2) takes over as primary maintainer, keeping the library updated through Minecraft’s frequent version changes and the migration from Bukkit to Spigot and Paper.

Modern Era

ProtocolLib reaches version 5.x with support for Minecraft 1.21.8, Java 17+, and Maven Central distribution. Over 625,000 downloads on the latest release alone.

What ProtocolLib Does

At its core, ProtocolLib intercepts network packets flowing between the Minecraft server and connected clients. Plugins register PacketListeners that fire when specific packet types are sent or received. The API wraps raw packet data in PacketContainer objects with type-safe getters and setters, so developers work with proper Java types instead of byte arrays.

Event-driven packet interception with typed read/write access to all protocol fields
Abstracts obfuscated NMS code so plugins survive Minecraft version updates
Inject custom packets into the network stream or cancel outgoing ones
Minimal performance overhead with timing diagnostics built in
Supports Bukkit, Spigot, and Paper across Minecraft 1.8 through 1.21.8
Published on Maven Central for straightforward dependency management

Common use cases include anti-cheat plugins that inspect movement packets, cosmetic plugins that modify entity metadata, chat formatting systems, tab list managers, hologram frameworks, and NPC plugins that create fake entities entirely through packets.

The Developers

Kristian Strangeland (aadnk)

Original creator of ProtocolLib. Kristian built the initial library and its core architecture — the PacketContainer system, the listener framework, and the reflection utilities that let ProtocolLib work across Minecraft versions without hardcoding NMS references.

Dan Mulloy (dmulloy2)

Current maintainer. Dan has kept ProtocolLib running through years of Minecraft updates, server platform changes, and Java version bumps. He manages the GitHub repository, reviews pull requests, publishes releases, and handles compatibility with new Minecraft protocol changes.

ProtocolLib is open source under the GPL v2.0 license. The project has 309 forks on GitHub, and community contributors regularly submit patches and compatibility fixes.

Why Developers Rely on ProtocolLib

ProtocolLib is not a plugin that players interact with directly. It runs silently in the background, providing infrastructure that other plugins depend on. Server administrators install it because their anti-cheat, hologram, or NPC plugin lists it as a dependency. Developers use it because writing raw NMS code for every Minecraft version is tedious and fragile.

The library has earned its position as a standard tool in the Bukkit/Spigot/Paper ecosystem. When server developers discuss packet manipulation on forums or Discord, ProtocolLib is almost always the first recommendation. Alternatives like TinyProtocol exist for simpler use cases, and PacketEvents has emerged as a newer option, but ProtocolLib remains the most widely used and battle-tested choice.

Its stability matters. Server owners running production environments with hundreds of concurrent players need their packet-dependent plugins to work reliably, and ProtocolLib’s long track record gives them confidence.

About This Website

Independent Resource

protocollib.net is an independent, fan-made informational website. We are not affiliated with, endorsed by, or connected to the official ProtocolLib developers (Kristian Strangeland or Dan Mulloy) in any way.

  • We provide guides, download links, and documentation references for ProtocolLib
  • All download links point to official sources (GitHub Releases, Hangar)
  • We do not host, modify, or redistribute the ProtocolLib plugin file
  • We respect the developers and their open-source work under the GPL v2.0 license
  • We encourage users to support the official project on GitHub

Our goal is to make it easier for Minecraft server administrators and developers to find accurate, up-to-date information about ProtocolLib in one place.

Have questions or feedback about this website? Visit our Contact page.

For official ProtocolLib support, bug reports, or feature requests, visit the ProtocolLib GitHub repository.