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socketio/socket.io

This system is a real-time communication framework that enables bidirectional, event-based communication between clients and servers. It provides a robust, scalable architecture supporting horizontal scaling through cluster engines and various adapters (Redis, PostgreSQL) for distributed environments. The codebase includes comprehensive examples demonstrating integration with modern web frameworks, authentication strategies, and diverse transport protocols including WebSockets, HTTP long-polling, and WebTransport.

63.9

Adequate · 3 August 2026

53k

lines of production code

TypeScript

with JavaScript

2

bus factor · 609 authors in all

3

measurements over time

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How it got here

2010–2020 · Modernization and example expansion

This period focused on modernizing the codebase by removing legacy client-side implementations, transport layers, and bundled vendor dependencies. Concurrently, the project expanded its documentation and usage guidance by adding a wide variety of new examples, including chat, whiteboard, clustering, and authentication integrations.

18 changes

2021–2024 · Monorepo migration and modularization

This period focused on restructuring the codebase into a monorepo, splitting the codebase into distinct packages for the core library, client, and parser. It also involved adding comprehensive test suites and build configurations for each module to ensure stability during the transition. Additionally, new examples were introduced to demonstrate modern frameworks and scaling strategies.

41 changes

2025–2026 · security hardening and adapter modernization

This period focused on strengthening security by fixing a SQL injection vulnerability in the PostgreSQL emitter and modernizing the cluster adapter architecture for better maintenance. Additionally, the team introduced a new Redis Streams emitter for server-side broadcasting and expanded the project's example suite to include HTTP/2 and PM2 cluster mode demonstrations.

5 changes

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About this page

  • The description of this project is derived from its own commit history, not from its README.
  • The score is its highest published measurement, taken on 3 August 2026 at a pinned commit. It is not a live figure and does not change until the project is measured again.
  • Measured at commit ae7fb46e08 — the exact code this score is about.
  • Scored under rubric rubric-2026.08.18. Score the same commit under that rubric and you get the same number.
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