isomorphic-ws
isomorphic-ws: A small open-source library for sharing WebSocket code across Node.js and browsers. Ranked #52 of 55 in WebSocket Tools by our editors (3.5/10); pricing: Free plan; best for teams sharing WebSocket code across Node and browsers.
At a glance
- Editor score3.5 / 10
- PricingFree plan
- Best forTeams sharing WebSocket code across Node and browsers
- Free planYes
- Paid fromNone
- Deployment modelLibrary
- Facts checked28 Sep 2026
Where it wins
- Uses ws in Node.js and native WebSocket in browsers
- Includes fallbacks for several browser WebSocket globals
- Ships with TypeScript declarations and standard API usage
Where it doesn't
- Provides a WebSocket library, not a hosted service
- Does not include broader server or messaging features
- Support is community-based
Our verdict on isomorphic-ws
isomorphic-ws is an open-source JavaScript library for developers who want one WebSocket import to work in both Node.js and browser code. In Node.js it exports the ws package; in browsers it resolves the native global WebSocket, with fallbacks for WebSocket, MozWebSocket, global, window, and self. Its focus is deliberately narrow: it supplies a shared interface rather than a hosted connection service or a broader messaging system.
The library fits JavaScript projects that need the standard WebSocket event and send usage across environments. It is installed through npm, supports CommonJS require/export usage, and includes a TypeScript declaration file. That makes it relevant for codebases sharing transport-facing logic between server-side and browser contexts, while still relying on the underlying environment-specific implementation. Teams seeking server management, messaging features, or a hosted service will need a different kind of product.
isomorphic-ws is free and open source, with self-hosted use and community support. There are no commercial tiers described; the choice is therefore less about comparing plans and more about whether this small compatibility layer matches the project’s needs. Pick it when a shared WebSocket interface and browser fallbacks address the main problem. Choose an alternative if you need managed connections, broader server capabilities, or support beyond community channels. Its value is in keeping the API familiar across Node.js and browsers, not in providing an end-to-end WebSocket platform.
isomorphic-ws pricing
isomorphic-ws fact sheet
| Free plan | Yes |
|---|---|
| Paid from | None |
| Deployment model | Library |
| Free concurrent connections | Not verified |
| Pub/sub messaging | Not verified |
| Self-hosting available | Not verified |
| Client SDKs | Node.js, browser JavaScript |
| Protocol support | WebSocket |
| Deployment | Self-hosted |
| Platforms | Web |
| Support | Community |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 28 Sep 2026 |
Alternatives to isomorphic-ws
- Socket.IOAn open-source library for real-time apps, with transport fallback and reconnection built in.9.3
- Ably Pub/SubFeature-rich managed pub/sub, with a free tier and paid plans from $29/month.8.8
- Azure Web PubSubA managed Azure service for real-time apps that need WebSockets, pub-sub, and scale.8.7
See all isomorphic-ws alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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