Socket.io

What it does

Socket.io creates a persistent connection between your browser and server so they can send messages to each other instantly — no page refresh needed. That's how chat apps, live notifications, and multiplayer games work.

When to use it

Use this when you need real-time features like chat, live notifications, or collaborative editing.

Real example

You're building a live collaborative notes app where multiple users see each other's changes instantly. Prompt: 'Use Socket.io client in React. On each keystroke in the textarea, emit a text-change event with the content. Listen for text-change from the server and update the textarea value for other connected users.'

Good to know

You need both a Socket.io client (in the browser) and a Socket.io server (Node.js). Supabase Realtime is an easier alternative if you're already using Supabase.

Alternatives

Install

Use cases

Language

Category

App memory & data sync