socketio/socket.io-client

Features

• Real-Time Connections - Establishes real-time bidirectional connections to servers using WebSocket or HTTP long-polling with automatic reconnection.
• Real-Time Communication - Establishes low-latency bidirectional connections with automatic transport fallback and reconnection for real-time communication.
• Cross-Origin Server Connections - Accept a server URL to establish a real-time connection across origins, requiring CORS to be enabled on the server.
• Named Event Messaging Frameworks - Provides a framework for sending and receiving named events with acknowledgements over real-time connections.
• Named Event Transmissions - Implements named event transmission with arbitrary data payloads between client and server in real time.
• Custom Event Emissions - Sends custom events to the server and handles incoming events using a publish-subscribe pattern.
• Namespace-Based Communication - Partitions a single connection into logical namespaces to separate application logic and authorization boundaries.
• Client-to-Server Event Emission - Enables emitting named events with serializable data from client to server, with optional acknowledgement.
• Namespace Connectivity - Allows specifying a namespace path in the connection URL to isolate communication channels within the same server.
• Server-to-Client Event Emissions - Ships a server-to-client event emission system for broadcasting messages to all connected clients or room subsets.
• Automatic Reconnection Logic - Implements automatic reconnection with exponential backoff to restore dropped connections without manual intervention.
• WebSocket and Fallback Connection Establishment - Establishes WebSocket connections and transparently falls back to HTTP long-polling when WebSockets are unavailable.
• Namespace Multiplexing - Provides namespace multiplexing to isolate communication channels on a single socket connection.
• WebSocket and HTTP Fallback Transports - Automatically selects the best available transport and falls back to HTTP long-polling when WebSocket connections fail.
• Client-Side Event Listeners - Implements client-side event listeners that execute callbacks when named server events arrive.
• WebSocket Clients - Establishes persistent bidirectional WebSocket connections with automatic HTTP long-polling fallback.
• Real-Time Namespace Channels - Splits application logic over a single connection using namespaces to create isolated communication channels.
• Namespace-Based Isolation - Splits application logic over a single connection by creating separate channels, such as an admin area for authorized users.
• Event-Driven Frameworks - Provides an event-driven framework for sending and receiving named events with acknowledgements over real-time connections.
• Named Event Exchanges - Provides event-based bidirectional messaging with named events, acknowledgements, and timeouts over a persistent connection.
• Cross-Instance Event Broadcasting - Routes real-time events to all connected clients across multiple server instances for horizontal scaling.
• Multi-Instance Event Broadcasting - Routes real-time events to all connected clients or room subsets across multiple server instances.
• Cross-Origin Client Connections - Supports connecting to servers from different domains with proper CORS configuration.
• Event Acknowledgement Strategies - Sends events and waits for a response from the receiver, with an optional timeout for unacknowledged messages.
• Acknowledgment Timeouts - Provides event acknowledgment with optional timeout handling for unacknowledged messages.
• Volatile Event Emission - Marks events as volatile so they are silently discarded when the socket is disconnected or the transport is congested.
• Disconnection Buffers - Queues outgoing packets during disconnection and replays them in order upon successful reconnection.
• External Process Emissions - Allows external Node.js processes to broadcast packets to all connected clients via the adapter's emitter package.
• Long-Polling Event Pushing - Automatically downgrades to HTTP long-polling when WebSocket or WebTransport connections cannot be established.
• PID Namespace Isolation - Partitions a single connection into isolated logical namespaces for separating application logic and authorization boundaries.
• Scoped Console Debug Logging - Prints scoped debug messages to the browser console when enabled via a storage flag for troubleshooting.
• Message Broadcasting Adapters - Provides a pluggable adapter interface for external processes to broadcast events to all connected clients.
• Scoped Client-Side Debug Logging - Prints debug messages to the browser console filtered by scope to aid development and troubleshooting.
• Debug Log Filters - Filters debug output to specific modules using wildcards and scope names separated by commas.
• Debug Logging Management - Activates scoped debug output via environment variable or storage flag to inspect internal module activity.

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