MongooseIM is a robust, scalable, open-source XMPP server designed for enterprise-grade instant messaging at massive scale.

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🚀 Overview

MongooseIM is a highly scalable, fault-tolerant instant messaging server built on Erlang by Erlang Solutions, supporting XMPP and other protocols for real-time communication.

It solves the problem of delivering reliable, high-performance messaging for large user bases, handling millions of concurrent users across clustered nodes with features like dynamic domain management, seamless multi-device switching, and automatic scaling.

It's built for enterprises, developers, and organizations in sectors like healthcare, finance, customer service, and social platforms who need customizable, secure, and compliant communication infrastructure.

Erlang Solutions developed it to leverage Erlang/OTP's concurrency and distribution strengths for production-ready XMPP deployments, evolving from ejabberd with enterprise enhancements.

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✨ Key Features

• Massive scalability with clustering, CETS distributed storage, and autoscaler for dynamic cloud resource adjustment (handles billions of users)
• Multi-protocol support: XMPP, REST/GraphQL APIs, WebSockets, SSE, BOSH, MQTT, AMQP
• Security & compliance: End-to-end encryption, TLS 1.3, FAST auth, FIPS 140-2, GDPR-ready
• Push notifications via MongoosePush for mobile (iOS/Android)
• Integrated WebRTC via MongooseICE for voice/video calls
• DevOps tools: Prometheus metrics, health checks, TOML config, Docker/Helm deployment
• Optional: Recent additions like RabbitMQ event pushing (v6.5), CockroachDB support (v6.3)

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🛠 Tech Stack

• Backend: Erlang/OTP (primary), Elixir (MongooseICE)
• Build: rebar3
• Database: Mnesia (default), PostgreSQL, MySQL, SQLite, CockroachDB, Redis
• Auth: XMPP SASL mechanisms, FAST, external (OAuth, etc.)
• Hosting: Self-hosted, Docker, Kubernetes (Helm chart), OS packages (Ubuntu, Debian, CentOS)

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👥 Who Is This For?

This project is useful for:

• Developers who want to build scalable real-time messaging backends
• Enterprises looking for fault-tolerant XMPP/IM servers
• Teams in regulated industries (healthcare, finance) needing secure comms

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📸 Screenshots / Demo

• Live demo: https://trymongoose.im
• GitHub: https://github.com/esl/MongooseIM

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🔥 Project Status

• 🟢 Actively building

Last updated: 2026-03-24

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❓ FAQ

Is this project free?

Yes / Open Source (Free to use, self-host; commercial support, consulting from Erlang Solutions.)

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Is the source code available?

Yes — https://github.com/esl/MongooseIM

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Can I contribute?

Yes — report issues/PRs on GitHub, follow CONTRIBUTING.md, or email mongoose-im@erlang-solutions.com. Add docs in doc/ folder.

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📬 Contact & Links

• Website: https://www.erlang-solutions.com/products/mongooseim.html
• GitHub: https://github.com/esl/MongooseIM
• Twitter/X: https://twitter.com/MongooseIM
• Email: mongoose-im@erlang-solutions.com

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