Bidirectional realtime communication for chats, live data and more.
Socket.IO enables communication in realtime, with server and client talking to each other in both directions. Over WebSockets, messages flow back and forth without constant polling, with an automatic fallback should a connection weaken. Beyond the bare connection, Socket.IO ships handy building blocks like named events, rooms for grouping clients and automatic reconnection. We use it to build chats, live dashboards, instant notifications and collaborative work in the same view.
More in the documentationWe reach for it as soon as something on screen should update instantly without you reloading the page. Through rooms we send updates only to the clients that have a particular project or document open. That keeps traffic small and the interface in sync for everyone involved.
import { Server } from "socket.io";
const io = new Server(3000);
io.on("connection", (socket) => {
socket.join("project-42");
io.to("project-42").emit("user-joined", { id: socket.id });
});Good to know
As soon as more than one server process runs, clients in different processes can no longer reach each other on their own. We put an adapter such as Redis in between, so events reach every recipient across all instances.
More tools we work with in the same area.
Node.js
A JavaScript runtime for performant, event-driven servers.
NestJS
A structured Node framework for clean, testable backend architectures.
Express
A lean, flexible framework for APIs and web services.
GraphQL
Flexible APIs that deliver exactly the data your client needs.
REST APIs
Clear, standardised interfaces for any integration.
tRPC
Type-safe APIs without schema duplication, end-to-end in TypeScript.
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