is-online
A Node.js and browser library to reliably check internet connectivity, going beyond navigator.onLine.
What is is-online?
is-online is a JavaScript library that checks if an internet connection is truly active and accessible. It solves the problem of `navigator.onLine` being unreliable in browsers by performing actual network requests to external services. The library works in both Node.js and browser environments, providing a promise-based API with configurable options like timeout, protocol version, and fallback URLs.
Node.js developers and frontend engineers who need to programmatically verify internet availability for features like offline mode detection, sync operations, or conditional UI rendering.
Developers choose is-online because it offers a robust, cross-platform solution that goes beyond basic online/offline detection. Its parallel checks, diagnostic capabilities, and customization options make it more reliable than ad-hoc implementations or the limited browser API.
Overview
Check if the internet connection is up
Use Cases
Best For
- Detecting true internet connectivity in Electron or NW.js applications
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