Create real-time, highly interactive apps quickly with the powerful XMPP protocol XMPP is a robust protocol used for a wide range of applications, including instant messaging, multi-user chat, voice and video conferencing, collaborative spaces, real-time gaming, data synchronization, and search. This book teaches you how to harness the power of XMPP in your own apps and presents you with all the tools you need to build the next generation of apps using XMPP or add new features to your current apps. Featuring the JavaScript language throughout and making use of the jQuery library, the book contains several XMPP apps of increasing complexity that serve as ideal learning tools. Learn about XMPP`s instant messaging features, such as rosters, presence and subscriptions, and private chats Covers XMPP stanzas, stanza errors, and client protocol syntax and semantics Discusses service discovery, data forms, and publish-subscribe Addresses