Package

socket.io

node.js realtime framework server

v4.8.3, 23 Dec 2025MITESM + CommonJSTypes: BundledWebSockets and realtime

$ npm install socket.io

npm GitHub Homepage

Key numbers

As of 25 Sept 2026

Weekly downloads: 13.7m; +84% over 12 months
Gzip bundle size: -; No Bundlephobia data
Dependencies: 7; Direct, from package.json
Last release: 9 months ago; v4.8.3
GitHub stars: 63.2k; 10.3k forks
Open issues / PRs: 164 / 27
Contributors: -
Commits, last 52 weeks: 147

Downloads

Last week 2026-09-15 to 2026-09-21

Weekly npm downloads, one point per week, weeks starting 23 Sept 2025 to 15 Sept 2026. The y axis starts at zero.

13,673,528 downloads last week, 63,584,710 in the last month. The 12-month change of +84% compares the average of the last 4 weeks with the first 4 weeks of the series.

Maintenance

Releases, last 12 months: 2150 in total
Latest version: 4.8.3, 23 Dec 20259 months ago
First published: 24 Dec 2010
Last push to GitHub: 24 Sept 2026same day as the snapshot
Repository archived: No
Open issues: 164
Open pull requests: 27
Commits, last 52 weeks: 147
Dependents on npm: 11,701

Major versions

v4 first release 4.0.0, 10 Mar 2021
v3 first release 3.0.0, 5 Nov 2020
v2 first release 2.0.0, 8 May 2017
v1 first release 1.0.0, 28 May 2014
v0 first release 0.3.8, 24 Dec 2010

Recent releases

Version	Published
4.8.3	23 Dec 2025
4.8.2	22 Dec 2025
4.8.1	25 Oct 2024
4.8.0	21 Sept 2024
2.5.1	19 Jun 2024
4.7.5	14 Mar 2024
4.7.4	12 Jan 2024
4.7.3	3 Jan 2024
4.7.2	2 Aug 2023
4.7.1	28 Jun 2023
4.7.0	22 Jun 2023
4.6.2	31 May 2023
4.6.1	20 Feb 2023
4.6.0	7 Feb 2023

Compatibility

Module format: ESM + CommonJSFrom package.json type, main and exports fields
TypeScript types: Bundled
Node.js engine range: >=10.2.0
Runtimes: -
Unpacked size (npm): 1.4 MB
Dependencies (7): corsdebugacceptsbase64idengine.iosocket.io-parsersocket.io-adapter

Install

npm install socket.io

CDN

jsDelivr: 1.2m requests in 30 days

jsDelivrhttps://cdn.jsdelivr.net/npm/socket.io@4.8.3/
unpkghttps://unpkg.com/socket.io@4.8.3/
esm.shhttps://esm.sh/socket.io@4.8.3

Alternatives

Package	Weekly downloads	Gzip	Last release	Module	Comparison
sockjs SockJS-node is a server counterpart of SockJS-client a JavaScript library that provides a WebSocket-like object in the browser. SockJS gives you a coherent, cross-browser, Javascript API which creates a low latency, full duplex, cross-domain communication	13.9m	-	4 years ago	CommonJS	-
ws Simple to use, blazing fast and thoroughly tested websocket client and server for Node.js	201.6m	-	1 month ago	ESM + CommonJS	-
simple-websocket Simple, EventEmitter API for WebSockets (browser)	696.2k	-	5 years ago	CommonJS	-
js-message A tiny, normalized JavaScript and JSON message envelope for every runtime boundary	1m	-	1 month ago	ESM + CommonJS	-

Sources: npm registry, npm downloads API, GitHub API, jsDelivr. Data fetched 25 Sept 2026.

Indexability: Indexed.