Socket.IO
A JavaScript library for real-time, two-way messaging between clients and servers.
- Stars
- 63.2k
- Forks
- 10.2k
- Licence
- MIT
- Language
- TypeScript
- Last update
- 1 months ago
- Type
- Library
What it is
Socket.IO lets a server and a web or app client send messages to each other continuously, instead of the client repeatedly asking for updates. It is used for things like live chat or live notifications. The README here is short and mostly points to the official documentation, so the detailed feature set is not described in this text.
- Build a live chat room where messages appear for all connected users
- Push live notifications from a server to open browser tabs
- Send real-time status updates, such as order tracking, to a web page
Great for
- Developers building live chat or real-time notifications in JavaScript or TypeScript
- Teams already using Node.js on the server side
- Projects that need two-way messages between browser and server
Not ideal for
- People who only need simple one-way updates or standard request-response APIs, since a plain HTTP approach may be enough
- Non-programmers, because it requires writing server and client code
- Projects needing a non-JavaScript server, since the README does not describe other server languages
How to get it
- 1
Install with a package manager
You'll need: Node.js
Install the package from npm
npm install socket.io - 2
Run it
- Install the package with npm in your Node.js project
- Create a server using the example in the official documentation at socket.io/docs/v4
- Connect a client from a web page using the matching client library
- Send a test message between client and server and confirm it arrives
- 3
Get the most out of it
- Read the official documentation at socket.io/docs/v4 for server and client setup
- Use the troubleshooting guide for connection problems
- Ask usage questions in GitHub Discussions or Stack Overflow rather than the issue tracker, as the README requests
Downloads
Strengths
- Widely used, with about 63,000 stars and an MIT license
- Actively maintained, with a recent push and a CI build badge in the README
- Has official documentation, a troubleshooting guide, and community support on Stack Overflow
Trade-offs
- The README is brief and defers almost all details to the external documentation site
- Requires JavaScript or TypeScript knowledge to use
- Real-time connections add server-side complexity compared with simple request-response code
How it compares
| Project | Stars | Type | Level | Updated | Best for |
|---|---|---|---|---|---|
| socket.io (this) | 63.2k | Library | intermediate | 1 months ago | Developers building live chat or real-time notifications in JavaScript or TypeScript |
| ws | 22.8k | Library | beginner | 5 days ago | Node.js developers who need a WebSocket server or a backend WebSocket client |
| uptime-kuma | 93.2k | App | beginner | 4 days ago | People who want to monitor their own websites or services without paying a hosted monitoring service |
| echo | 32.8k | Library | intermediate | 6 days ago | Go developers building REST APIs or backend services |
| dockge | 24.7k | App | beginner | 14 days ago | People who run Docker Compose stacks on a home server or small Linux machine |
| frappe | 11k | Library | advanced | 4 days ago | Developers building business or internal data-heavy applications |
Stats synced from GitHub. The assessment above was drafted with AI from the project's README on 2026-10-29 and may miss recent changes — check the README before relying on a command. MIT licence: free to use, modify and distribute, including commercially, as long as you keep the copyright notice.