# openimsdk/open-im-server

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16,469 stars · 2,914 forks · Go · Apache-2.0

## Links

- GitHub: https://github.com/openimsdk/open-im-server
- Homepage: https://openim.io
- awesome-repositories: https://awesome-repositories.com/repository/openimsdk-open-im-server.md

## Topics

`chat` `im` `messaging` `messenger` `openclaw`

## Description

Open-IM-Server is an instant messaging server and cross-platform messaging backend designed for real-time text and media communication. It provides a distributed chat architecture that coordinates user sessions and group communications across multiple server nodes to support millions of concurrent users.

The system features a scalable message distribution model that utilizes asynchronous message pipelines and distributed queueing to maintain reliability during traffic spikes. It employs multi-level data caching across local memory and distributed stores to reduce latency and uses a document-based data model for handling unstructured information.

The project covers a broad range of communication capabilities, including user identity and session authentication, friend relationship management, and large-scale group communication. It provides programmable APIs for chat integration, server health monitoring via dashboards, and offline push notifications routed through third-party gateways.

## Tags

### Networking & Communication

- [Cross-Platform Messaging Backends](https://awesome-repositories.com/f/networking-communication/cross-platform-messaging-backends.md) — Ships a cross-platform messaging backend with platform-specific binaries to integrate chat logic into diverse environments. ([source](https://docs.openim.io/sdks/introduction))
- [Messaging Backends](https://awesome-repositories.com/f/networking-communication/messaging-backends.md) — Provides a centralized chat infrastructure supporting multiple client environments and large-scale communication.
- [Messaging Logic Embedding](https://awesome-repositories.com/f/networking-communication/chat-client-integrations/messaging-logic-embedding.md) — Offers programmable interfaces and platform-specific binaries to embed real-time messaging capabilities into client apps. ([source](https://docs.openim.io/))
- [Chat Session Management](https://awesome-repositories.com/f/networking-communication/chat-session-management.md) — Handles the creation and property management of private and group communication sessions. ([source](https://cdn.jsdelivr.net/gh/openimsdk/open-im-server@main/README.md))
- [Client Connectivity Management](https://awesome-repositories.com/f/networking-communication/client-connectivity-management.md) — Implements mechanisms for establishing and maintaining stable long-lived connections between clients and the server. ([source](https://cdn.jsdelivr.net/gh/openimsdk/open-im-server@main/README.md))
- [Real-time Messaging](https://awesome-repositories.com/f/networking-communication/communication-platforms-services/communication-platforms/real-time-collaboration-suites/real-time-messaging.md) — Provides programmable interfaces and APIs for integrating real-time messaging into client applications.
- [Connection Lifecycle Managers](https://awesome-repositories.com/f/networking-communication/connection-lifecycle-managers.md) — Manages the lifecycle of long-lived client-server sockets using keep-alive signals to ensure stable real-time communication.
- [Instant Messaging Services](https://awesome-repositories.com/f/networking-communication/instant-messaging-services.md) — Enables real-time text and media communication between users through persistent connections. ([source](https://docs.openim.io/sdks/quickstart/reactNative))
- [Large-Scale Group Communication](https://awesome-repositories.com/f/networking-communication/large-scale-group-communication.md) — Provides a distributed architecture capable of facilitating high-availability messaging for millions of users in large groups. ([source](https://cdn.jsdelivr.net/gh/openimsdk/open-im-server@main/README.md))
- [Messaging Servers](https://awesome-repositories.com/f/networking-communication/messaging-servers.md) — Provides a backend system for real-time text and media communication supporting millions of concurrent users.
- [Distributed Chat Architectures](https://awesome-repositories.com/f/networking-communication/messaging-servers/distributed-chat-architectures.md) — Implements a distributed architecture that coordinates user sessions and group communications across multiple server nodes.
- [Real-Time Messaging](https://awesome-repositories.com/f/networking-communication/real-time-messaging.md) — Offers a set of programmable interfaces for embedding chat features and identity management into clients.
- [Chat Entity Management](https://awesome-repositories.com/f/networking-communication/chat-entity-management.md) — Provides server-side APIs to automate the creation and configuration of user accounts and chat groups. ([source](https://docs.openim.io/restapi/apis/introduction))
- [Event-Driven Webhooks](https://awesome-repositories.com/f/networking-communication/event-driven-webhooks.md) — Implements event-driven webhooks to trigger HTTP requests to external URLs upon specific system events.
- [Friend Relationship Management](https://awesome-repositories.com/f/networking-communication/friend-relationship-management.md) — Tracks and updates user friendships to control who can initiate communication and access profiles. ([source](https://cdn.jsdelivr.net/gh/openimsdk/open-im-server@main/README.md))

### Data & Databases

- [Chat History Synchronization](https://awesome-repositories.com/f/data-databases/data-engineering-infrastructure/data-persistence-storage/data-storage/metadata-state-management/chat-history-synchronization.md) — Synchronizes and persists conversation history and user metadata across local and server-side storage.
- [Message Queue Integrations](https://awesome-repositories.com/f/data-databases/message-queue-integrations.md) — Utilizes asynchronous message pipelines and distributed queueing to maintain reliability during traffic spikes.
- [Multi-level Caching](https://awesome-repositories.com/f/data-databases/multi-level-caching.md) — Reduces latency via multi-level data caching across local memory and distributed stores. ([source](https://docs.openim.io/blog/introduction))
- [Historical Data Querying Interfaces](https://awesome-repositories.com/f/data-databases/data-access-querying/historical-data-querying-interfaces.md) — Implements server-side retrieval of past conversations and logs to populate client history interfaces. ([source](https://docs.openim.io/sdks/quickstart/browser))
- [Client-Side Persistence](https://awesome-repositories.com/f/data-databases/data-engineering-infrastructure/data-persistence-storage/data-storage/client-side-persistence.md) — Enables saving chat records and metadata locally on the device to support offline access.
- [Document-Based Storage](https://awesome-repositories.com/f/data-databases/data-engineering-infrastructure/data-persistence-storage/data-storage/document-based-storage.md) — Employs a document-based data model to handle large volumes of semi-structured information. ([source](https://docs.openim.io/blog/introduction))
- [Document Database Modeling](https://awesome-repositories.com/f/data-databases/document-database-modeling.md) — Employs a document-based data model to store flexible, semi-structured information for diverse message types.

### DevOps & Infrastructure

- [Distributed Messaging](https://awesome-repositories.com/f/devops-infrastructure/distributed-messaging.md) — Routes high volumes of real-time messages and notifications across a distributed architecture.
- [Queue-Based Message Distribution](https://awesome-repositories.com/f/devops-infrastructure/message-queues/queue-based-message-distribution.md) — Utilizes high-throughput distributed queues to decouple components and handle traffic spikes reliably.
- [Traffic Spike Buffering](https://awesome-repositories.com/f/devops-infrastructure/message-queues/queue-based-message-distribution/traffic-spike-buffering.md) — Employs message queues to absorb traffic spikes and decouple components for higher reliability. ([source](https://docs.openim.io/blog/introduction))
- [Push Notification Services](https://awesome-repositories.com/f/devops-infrastructure/push-notification-services.md) — Routes messages through third-party gateways to deliver push notifications to inactive mobile users.

### Security & Cryptography

- [Identity Authentication](https://awesome-repositories.com/f/security-cryptography/identity-authentication.md) — Provides session-based authentication and connection status monitoring with automatic token refreshes. ([source](https://docs.openim.io/sdks/quickstart/browser))
- [User Identity Management](https://awesome-repositories.com/f/security-cryptography/user-identity-management.md) — Manages user account initialization, identity data, and relationship mapping between users. ([source](https://cdn.jsdelivr.net/gh/openimsdk/open-im-server@main/README.md))
- [Local Chat Data Storage](https://awesome-repositories.com/f/security-cryptography/private-data-privacy-tools/local-chat-data-storage.md) — Provides local storage for chat data and settings on the device to enhance privacy and access speed. ([source](https://docs.openim.io/sdks/introduction))

### Software Engineering & Architecture

- [Session Coordination](https://awesome-repositories.com/f/software-engineering-architecture/user-state-management/session-coordination.md) — Coordinates user session state and conversation history across multiple distributed server nodes for high availability.

### Part of an Awesome List

- [Messaging Multimedia Transmission](https://awesome-repositories.com/f/awesome-lists/media/media-and-files/messaging-multimedia-transmission.md) — Supports the transmission of text, images, and videos with server-confirmed delivery structures. ([source](https://docs.openim.io/sdks/quickstart/browser))
- [Communication and Messaging](https://awesome-repositories.com/f/awesome-lists/media/communication-and-messaging.md) — Open-source IM server.

### System Administration & Monitoring

- [System Health Monitoring](https://awesome-repositories.com/f/system-administration-monitoring/observability-instrumentation/system-health-monitoring.md) — Collects system metrics and visualizes performance via dashboards to track stability. ([source](https://docs.openim.io/guides/gettingStarted/dockerCompose))
- [Conversation Metadata Management](https://awesome-repositories.com/f/system-administration-monitoring/user-group-management/conversation-metadata-management.md) — Manages user profiles and conversation metadata such as read receipts and message recall to synchronize state. ([source](https://docs.openim.io/sdks/quickstart/browser))

### Web Development

- [System Event Webhooks](https://awesome-repositories.com/f/web-development/external-event-integration/system-event-webhooks.md) — Provides webhooks that trigger external backend processes or messages based on system-level events. ([source](https://cdn.jsdelivr.net/gh/openimsdk/open-im-server@main/README.md))