Real-Time Features: WebSockets vs Server-Sent Events
Adding Real-Time Features to Your Web App
Live notifications, chat, real-time dashboards, collaborative editing — these features need data to flow from server to client instantly. Two main technologies enable this: WebSockets and Server-Sent Events (SSE).
WebSockets: Full-Duplex Communication
WebSockets open a persistent, two-way connection between client and server. Both sides can send messages at any time.
- Best for: Chat, multiplayer games, collaborative editing, trading platforms
- Pros: True bidirectional, low latency, efficient for high-frequency updates
- Cons: More complex to implement, harder to scale, requires sticky sessions
Server-Sent Events: One-Way Stream
SSE provides a one-way channel from server to client over regular HTTP. Simple, reliable, and auto-reconnects.
- Best for: Notifications, live feeds, dashboards, progress updates
- Pros: Simple to implement, works with HTTP/2, auto-reconnect built in, no special infrastructure
- Cons: One-direction only (server → client), limited to text data, 6 connection limit per browser
Decision Guide
| Need | Use |
|---|---|
| Live notifications/alerts | SSE |
| Chat/messaging | WebSocket |
| Dashboard data updates | SSE |
| Collaborative editing | WebSocket |
| Live sports scores/feeds | SSE |
| Online gaming | WebSocket |
| Progress indicators | SSE |
Rule of Thumb
If the client only needs to RECEIVE updates: use SSE (simpler). If the client needs to SEND and RECEIVE in real-time: use WebSockets.
Building a Real-Time App?
SecureTechs develops web applications with real-time features — from live dashboards to chat systems. We choose the right technology for your specific use case. Book a free consultation.